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Review: Trek Session 9.9 29

Trek Session 9.9 Review - title image

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Mountain Bike Action Magazine

Bike Test: Trek Session 9.9 29

2021 trek session 9.9 29

Downhill is one of the gnarliest forms of mountain biking, requiring rigs that look more like off-road motorcycles than traditional bicycles; however, unlike its motorized cousins, a downhill bike requires gravity to propel it down the mountain. These bikes are some of the hardest to justify buying, unless of course you live in close proximity to a ski resort or have a good group of friends willing to take turns being the shuttle driver.

For that reason, MBA doesn’t test many downhill bikes; however, the new wave of 29er downhill bikes had many of our test riders curious to know what it would be like to ride a 7.5-inch-travel rig with fast-rolling 29-inch wheels. So, we decided to test one. We are stoked to introduce you to one of the winningest bikes on the World Cup Downhill circuit—the Trek Session 9.9 29.


The Session has been in Trek’s lineup for years now and has featured many wheel sizes along the way, starting with the 26-inch wheel and later moving towards the 27.5-inch model, which is still available today. The 29er version was only offered as a frame, fork and shock package until the 2019 model year when Trek unveiled the bike we have here today. The Session 9.9 is Trek’s top-of-the-line 29er downhill race bike. So, who is it made for? Well, World Cup downhill racers; however, we’re sure Trek also expects to sell these high-octane bicycles to more human-like riders such as ourselves.

The Session 9.9 29 is designed for riders looking for an edge in competition or the ability to transform black-diamond trails into blue ones.


Trek designed the Session around many of its flagship technologies that we’ve come to know and love, such as OCLV (Optimum Compaction Low Void) Mountain carbon. OCLV is a process used across Trek’s carbon mountain bike lineup to ensure the right balance of stiffness, strength and durability. A Mino Link Flip Chip, along with fixed-angle headset cups, allows riders to fine-tune the Session’s geometry to better match different riding styles and types of terrain. The bike uses a four-bar suspension design with 190mm of travel, along with Trek’s patented ABP (Active Braking Pivot) to better separate suspension and braking forces. Trek then added armor to protect vulnerable areas, such as the downtube.


The Session 9.9 is a purebred race bike equipped with nothing but the best. Starting with its suspension, we see a 190mm-travel Fox Factory 49 fork, which builds off the popular Fox 40; however, the arch is modified to allow clearance for a taller wheel. In back, Trek spec’d a 2019 Fox Factory Float X2 with a new mechanical bottom-out bumper to provide a more progressive end stroke. Our Session rolls on Bontrager Line 30 downhill wheels, with a Boost 110×20 hub up front and a Boost 157×12 hub with a seven-speed downhill freehub in the rear. Trek added a burly MRP G4 carbon chainguide and gave the bike a full Shimano Saint groupset. Bontrager parts round out the rest of the build, including the cockpit, saddle, seatpost and tires.

2021 trek session 9.9 29


Setting sag: Trek spec’d the Session with Fox Factory-level suspension, which we opted to set up with 30-percent sag front and rear. We then made adjustments to our compression and rebound until we found our sweet spot. The Session’s rear air shock made it easy to set sag without having to worry about swapping a coil spring. This means riders of all sizes can tune the suspension to their liking without purchasing extra parts.

Moving out: Once you toss a leg over the Session, it immediately becomes apparent that this is a purebred race machine built to take on the world’s toughest World Cup tracks. The big wheels, slack angles and wide 820mm handlebars all come together to inspire confidence—no matter what obstacles are in front of this beast. Prior to our testing, we trimmed the seatpost down 3 inches in order to have a lower center of gravity over the bike. Racers often run a taller saddle height than park riders; however, even for racing, the stock seatpost seemed a bit too high.

Overall, the Session has a comfortable fit, and while the reach measurement looks short on paper, standing over the bike feels natural.

Cornering: Our test riders expected the Session 29 would be like a monster truck made to straight-line its way down the mountain, and while that was somewhat true, this big-wheeled downhill machine surprised us. While the Session isn’t a slasher-type bike that lets you smash the rear wheel into corners, it does track through turns impressively well and changes direction with relative ease. Of course, a little extra speed helps liven this bike up, but even in slower situations the Session navigated the trails quite well.

2021 trek session 9.9 29

Descending: “Faster than a speeding bullet” is probably the best way to describe this bike’s ability to descend. The Session picks up speed as if it has a hidden motor tucked away in its bottom bracket. Even after getting on the brakes hard mid-run, it gets right back up to speed as if it never slowed down at all. This is likely attributable to the fast-rolling 29-inch wheels; however, Trek’s geometry and detailed suspension tuning play a major role here. The Session is most at home eating up rough and rocky black-diamond trails but isn’t afraid to take on bigger jump lines, either. Park riders may find the 29-inch wheels harder to toss around; however, any rider looking to improve his or her time to the bottom of the mountain will benefit from the larger-diameter wheel.


Trek offers the Session as a frame-only option or as the compete model we tested. Our bike came with components suited for a pro racer; however, we made a few changes to enhance our control and confidence. First things first, we trimmed our seatpost to achieve a deeper insertion, allowing for more room to move above the bike. We then swapped out the Bontrager handlebar and stem for a Renthal cockpit and added a custom-printed ODI number plate.


Diehard downhill racers are more likely to purchase this bike than park rats. Trek designed this bike for riders looking for the fastest way down the mountain who aren’t afraid to put up the cash to do so. Trek continues to offer the 27.5-inch model, which sells for a more affordable $4730, and will likely suit the needs of riders wanting a fun park bike they can toss around jump trails. That said, the Session 29 is the ultimate weapon for riders who need it. The bike blasts down the mountain with precision and control, turning the gnarliest terrain into a casual walk in the park.  www.trekbikes.com

2021 trek session 9.9 29


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2021 trek session 9.9 29

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Trek Session 9.9 29

Words by Drew Rohde | Action Photos by Trevor Lyden

You’d never guess it by looking at the Trek Session 29’s meticulously clean lines or attention to detail, but Trek created this bike knowing full well that sales numbers would pale in comparison. Downhill bikes cater to an increasingly small percentage of riders, and 29-inch wheeled DH bikes are going to segment that group into an even smaller section. If you compare Session sales to Fuel, Remedy and Slash models, the world-renowned Session looks more like an experiment in marketing than good business. Despite the unlikely return on R&D, design time and production mold dollars, Trek forged ahead creating one of the most beautiful, downhill bikes I’ve ever seen. After ogling over a pre-production Session 9.9 29 at Crankworx Whistler, I was anxious to get a long-term tester to see if the love affair would last once things got down and dirty.

In an effort to remain open minded, I try to not study the numbers on our test bikes before I write reviews. I’ll be totally honest, I either didn’t know or totally forgot that the Session 9.9 29er had 190mm of travel. Regardless of my newfound knowledge, the bike handled everything I threw at it thanks to the Fox Factory Fit 40 RC2 fork and Fox Factory Float X2 shock. Oh yeah, and the 29” wheels.

Trek equips the Session 29 with all of their standard features you’ve come to know over the years. The Session 9.9 is their top of the line model, and the frame is built using Trek’s OCLV (Optimum Compaction Low Void) carbon process that has been evolving since 1991. A magnesium Evo Link houses the adjustable Mino Link chip – an easily adjustable piece of hardware that changes the head tube angle and BB height.

Frame features also include an integrated frame protector, Control Freak cable routing, Carbon Armor, ABP (Active Braking Pivot) 4-link suspension design and adjustable fixed-angle headset cups.

The Session 9.9 29er is race-ready and boasts a 7-speed Shimano Saint drivetrain and Shimano Saint brakes. A particular highlight I enjoy is the very sexy MRP G4 carbon chainguide. Rolling stock on the Trek Session 9.9 29 comes in the form of Bontrager Line DH 30 wheels, with Boost 110×20/157x12mm spacing. Bontrager G5 Team Issue 2.5” tires offer excellent grip, however I did flat the rear tube twice. I haven’t flatted a DH bike in years so I’m not sure if the tubes are especially thin or if it’s the tire. Either way, I went tubeless and haven’t had any issues since.

More Bontrager goodies fill the cockpit: Line Pro 820mm bars, a Line Pro Direct Mount 50mm stem and XR Trail Elite grips, which we removed pretty quickly. After a near death experience clipping a tree just before a drop, I cut down the bars to about 777mm, and while they have a strange look and feel at first, they weren’t something I focused on once I started riding.

I was both surprised and reaffirmed when I learned the Session 9.9 29er has 190mm of travel. As mentioned above, I don’t look at the details of a bike before riding it. Clearly I can’t be totally unaware of what some bikes offer, but I try to avoid the spec sheet until after my testing, or sometimes mid-test if something doesn’t feel right. I want to be open minded and let the bike speak to me during the test period without my brain telling me what I should be feeling based on a chart.

The shortened travel wasn’t something I completely noticed during my test rides, but in hindsight it made sense. What I mean by that is, the bike rode differently than the 27.5 and 26-inch Sessions when it came to landing drops or larger jumps. It did not feel harsh by any means, it just had a firmer feel that I attributed to more progression in the tune. I reached full travel every run during my testing, but never felt harsh hits or that I was out of travel. That doesn’t mean I wouldn’t like more though. If possible, I’d love to see this bike with 195mm or even 200mm of travel.

So how does it ride with those big wheels and shorter travel? Like a daggum rocket ship! I rode a demo bike briefly in Whistler Bike Park. It was slack, low and certainly better than some of the other bikes I rode that week, but I wanted more. It was a well-worn demo bike and I knew the understeer and suspension issues I experienced were tunable. Before hopping on the chairlift for my first ride, I got sacrilegious. I put the Mino Link in the High mode! Since I wasn’t dropping into Val Di Sole, I figured I had the ability to navigate the terrain I was about to ride with a head angle more nimble than 62.1 degrees.

What I felt on that first ride was pure magic. I had no understeer, the bike stood up a bit taller, was a little bit shorter and put me right where I wanted to be – in a position to command the bike. That first ride was the beginning of what I hope is a long relationship (Wink wink, Trek can I keep it?) I only spent about two runs tweaking suspensin and quickly settled in on my tune. As my speed increased with familiarization to the bike, I added about five more PSI and 2-3 clicks of compression depending on the track.

I’m not always a fan of the Fox 40, as it can ride a bit stiff and beat up my hands, but this fork feels buttery smooth and the rear shock is the same. I actually found that running a little bit more sag was preferred for my riding style and terrain. I don’t live for the jump lines, instead preferring the natural steeps and chunky stuff with natural gaps. The softer spring rate kept me on the ground when I wanted, but added compression prevented me from blowing through travel when I didn’t. I’m sure this softer set up is also why I was reaching bottom out on all my race-paced test runs, but this isn’t a bad thing according to some schools of thought. The trade off for regularly using all the travel is insane traction and confidence, well above what many other bikes have offered me.

While the suspension performance is a highlight of the Session 9.9 29, the thing that blew me away is the out and out speed of the bike. Specifically, how fast it gets up to speed. I took two practice runs down a newer trail at Mt. Bachelor that is a steep fall line and navigates everything from lava rock to flat, loose turns, massive ruts and very aggressive roots. During my sighting laps I’d inspect lines, erosion changes, etc. Every time I hopped back on the Session 29 and let off the brakes I was instantly back up to speed, like I’d never stopped. No pedal strokes needed, the bike just picked up steam and charged down the trail like I was trying to scare myself!

The larger wheels are definitely noticeable and something I was very aware of every time I got on the bike. This is both good and not so good. The bike feels a bit larger and gives me a feeling of being right in the middle of two massive steamrollers. Benefits of the big wheels are plentiful, as the bike is beyond stable and allows for errors in line selection or lazy riding while still maintaining top speed because the added roll-over ability offers a larger margin of error. However, if you screw up the entry to a tight turn like a switchback, the length and big wheels will not treat you well. Swinging wide is the way to go, but if you live to jackknife corners like you’re always being filmed for an Instagram edit, you’ll have your work cut out for you.

Another noteworthy point is the seat height. I’m not quite six foot and rode a size large and had to cut quite a bit off the seat post. If you think of DH bike seat post heights by comparing a World Cup racer to a FEST Series rider, you’ll know that there is a big difference in riding style. This bike is most definitely a racer as the larger wheels don’t allow for a totally slammed post, and this may be an issue for riders with short legs, especially if you’re a big jumper. Which is another place that the Session 9.9 29er didn’t completely blow me away.

Downhill bikes are very purpose specific tools, and this is very clearly a race rig, so I didn’t expect it to be a whip machine. I’m not Brendan Fairclough or some amazing rider, but the added rotational mass was definitely noted when I wanted to make quick changes in the air. Still, the 34.91-pound weight and poppy suspension feel kept me more than happy when I was playing around on the jumpy stuff.

The Wolf’s Last Word

Alright, so let’s pretend we’ve all got A.D.D and you just asked me if you should buy this bike because you don’t have time to read. If I had to reply in one word I’d say, “Hellyes!” BUT, I’m also very chatty when it comes to bikes so instead I’d like to ask what your budget is, what type of riding you prefer most and what you want out of your DH bike.

If you’ve got the budget, are looking for a flat out race machine to make you as competitive as possible, love plowing over shit as fast as you can, or want something to give you that extra little edge when it comes to racing the clock, then I think the Session 9.9 29er is probably one of my top recommendations. If you think spending over eight grand on a bicycle is ridiculous, love to jump, whip and slash, then I’d suggest looking at other options, perhaps a Session 8 27.5 ($4,279).

Ultimately, the Session 9.9 29 has become one of my favorite DH bikes in recent memory. Then again I’m the type of guy who goes to Whistler Bike Park and proudly skips A-Line in favor of the least popular woodsy DH tracks I can find. For me, the trade off in playfulness on the jump lines is well worth the added speed, traction and comfort on proper downhill trails. Just make sure you keep the spokes real tight, or else they’ll be making some weird noises!

Price: $8,399 Weight: 34.91 lbs Website: Trekbikes.com

CHASSIS Frame: OCLV Carbon; 190mm Fork: Fox Factory 40 Fit RC2; 190mm Shock: Fox Factory Float X2; 225x70mm

COCKPIT Brakes: Shimano Saint Handlebar: Bontrager Line Pro; 820mm Headset: FSA Orbit Saddle: Bontrager Arvada Seatpost: Bontrager Rhythm Elite Shifter: Shimano Saint; 10s Stem: Bontrager Line Pro DM; 50mm

WHEELS Hubs: Bontrager Rims: Bontrager Line DH 30 Tires: Bontrager G5 Team Issue; 29×2.5

DRIVETRAIN Bottom Bracket: Shimano BB80 Cassette: Shimano CS-5700; 11-25t Cranks: Shimano Saint M825; 34t Derailleur: Shimano Saint Shadow Plus; 10s

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$4,999 High-Pivot Trek Session 8 Review - Vital's Summer of Downhill 7

We see how the most winning world cup downhill bike of all-time performs with the addition of a high-pivot suspension design and full aluminum frame..

Profile picture for user Jason_Schroeder

R ound two, flight! Two weeks ago, we kicked off Vital’s Summer of Downhill with Pivot’s Phoenix 29 . Sporting dual 29-inch wheels, a full carbon frame and no geometry adjustments the Phoenix 29 had the nicest build spec in our downhill bike test pool. But what about something for all you downhill rippers on a budget? Or all you mixed wheel size fanatics? Coming in a few thousand dollars cheaper with multiple wheel size configurations, geometry adjustments and a full aluminum frame, our second downhill test bike this Summer is the all new 2022 Trek Session! Following years of success and racing accolades, Trek completely revamped their Session downhill bike in 2021 which now sports a high-pivot suspension design and idler pulley. With the addition of Loris Vergier to their already stacked Trek Factory Racing downhill roster, the new Session was developed with the goal of winning races at the highest level. But as we prefaced at the beginning of our Summer of Downhill, not everyone wants a full-on race bike for their daily steed. We spent plenty of time riding bermy, bike park jump trails to see if the new Session is more than just a technician in the rough. 

Did you really think we would introduce the new Session and not mention Reece Wilson’s swan dive from Les Gets last month? Only entertaining now knowing Reece is okay, we don’t think his Session felt that hit as hard as he did.

Trek Session 8 29 GX Highlights

  • Full aluminum frame
  • 29-inch wheels (mullet configuration or dual 27.5-inch wheel options possible)
  • 200mm (7.8-inches) of rear wheel travel // 200mm (7.8-inches) front travel
  • High-pivot suspension design
  • Size-specific chainstay length
  • Adjustable shock progression 
  • RockShox BoXXer Select fork
  • FOX VAN Performance rear shock
  • SRAM Code R brakes
  • SRAM GX 7-speed drivetrain
  • 29 x 2.50 Bontrager G5 Team Issue tires, wire bead, 2-ply front and rear 
  • 157x12mm rear hub spacing
  • Full coverage downtube protector
  • Internal or external cable routing options
  • Threaded bottom bracket with ISCG-05 2-bolt chain guide mount
  • Test bike weight (size R2, no pedals): 37.9-pounds (17.2kg)
  • Sizes: R1, R2, R3, (for riders from: 5' 3" to 6' 5")
  • MSRP $4,999 USD

The Winningest Downhill Bike Of All-Time

2007 Trek Session 77

Added to the Trek lineup back in 2005, the Session platform began as a longer travel trail bike but quickly evolved to meet the demands of downhill riding. Likely the most recognizable downhill bike of the past decade, the Session most people are familiar with was released in 2008. Utilizing Trek’s ABP (Active Braking Pivot) suspension platform with a rear shock that floated between pivots, the Session has remained mostly unchanged since its initial debut. Besides adjustments to geometry and small frame details, the largest change has been the switch to Trek’s OCLV Carbon frame. However, often forgotten is the Trek Session 10. Only in production from 2006-2008, the Session 10 could have served as a crystal ball for what was to come a decade later sporting a high, single-pivot suspension design and idler pulley.

The Trek Session has been a part of many memorable racing moments over the years. Rachel Atherton winning her 5th downhill World Championship by nearly 10 seconds definitely stands near the top of that list.

When it comes to racing, the Session has graced more downhill World Cup podiums than any other bike thanks to the talent of Aaron Gwin, Rachel Atherton and Tracey Mosley. Undeniably a capable race bike, the Session has also taken Trek’s C3 Project athletes to multiple Red Bull Rampage podiums and has been featured in some of our industry's most iconic film projects. We could argue all day if the multiple World Cup podiums or handful of  Brandon Semenuk edits  have led to more Session downhill bikes being sold. Point made: Trek’s Session is a proven, capable and winning downhill bike in multiple settings.

Trek Session 8 29 GX Overview

2021 trek session 9.9 29

Never a brand to be content with their success, Trek caught everyone's attention in April with the release of the all-new, highly-refined Session. At a glance, the new platform generally resembles the past frame configuration with the most obvious change being the addition of an idler pulley and high-pivot suspension layout. The second noticeable difference is the full aluminum frame. The new Session is visually more robust and industrial looking compared to its smooth, carbon predecessor. Trek states the change in material was driven by their World Cup riders' feedback and need for more frame compliance. This decision resulted in a nearly 4-pound weight difference between the previous top tier Session 9.9 29 (33.67-pounds/15.27kg) and the 2021 Session 9 X01 (37.65-pounds/17.08kg). Located at the lower shock eyelet is a Mino Link flip chip which changes shock progression between 20% and 25%. The shock is still driven by a rocker link where two more Mino Link flip chips can be found at the junction of seat stays and rocker. Flipping these chips adjusts head angle from 63 to 63.6-degrees and bottom bracket height by 9mm. At the rear of the bike, Trek is still using their ABP (Active Braking Pivot) design which keeps the suspension active while under braking forces for improved traction and stability. Other frame details include the option to run cables internally or externally, full coverage plastic down tube protector, ribbed chain stay protector, threaded bottom bracket and 12x157mm rear wheel spacing.

2021 trek session 9.9 29

Trek is offering the new Session in three sizes: R1, R2 (tested) and R3. Each frame size maintains 200mm of rear wheel travel but has size-specific chain stay lengths. A feature we personally enjoy, the goal is to not only improved fitment, especially while descending, but ideally it keeps riders of varying heights centered over their bike. Trek is also giving riders the option to run any modern wheel configuration they please. Although developed around, and sold with 29-inch wheels, riders can flip the Mino Link into the high position to achieve a mixed-wheel setup. For riders wanting dual 27.5-inch wheels without having to swap their 29-inch fork, Trek is selling an EXT tall lower headset cup. The headset cup is included with frame only options or sold separately for complete builds.

2021 trek session 9.9 29

Of the two build options available from Trek, we tested the cheaper Session 8 29 GX which retails for $4,999 USD. The only other complete build option is the more expensive Session 9 X01 which retails for $6,999 USD. Sharing the same aluminum frame between both builds, the Session 8 build spec is highlighted by a RockShox Boxxer Select fork, FOX VAN Performance coil rear shock, Code R 4-piston brakes, SRAM GX DH 7-speed drivetrain and Bontrager Line DH 30 aluminum wheels. If you were looking to build up your own high-pivot Session, the frame only option with FOX VAN Performance coil rear shock retails for $2,999 USD. It is also worth noting for those nostalgic riders not wanting to jump on the high-pivot train - Trek is still selling (at the time this article was written) their previous generation Session in carbon, aluminum, 29-inch wheel and 27.5-inch wheel options.          

Test Riders

Piloting our Trek Session 8 test bike was Vital’s own Jason Schroeder and long-time contributor, Sean “Griz” McClendon. Both have an extensive history within the mountain bike industry. First between the tape racing DH at the National and World Cup level followed by years working for multiple brands within the mountain bike industry. With a decade age gap and a few pounds between them, they each have their own unique preferences and riding styles.

Setup, Fitment and Suspension Settings

As with all the downhill test bikes that will be a part of Vital’s Summer of Downhill shootout, we tested our Session 8 with the stock parts that come with the GX build. To match our test rider heights of 5-foot-10-inches and 6-foot, Trek provided a size R2 Session 8. The middle of the three sizes available, the R2 frame with dual 29-inch wheels in the low Mino Link configuration has a 465mm reach, 445mm chainstay length, and 1277mm wheelbase. When set up with a 29-inch front wheel, 27.5-inch rear wheel, and the high Mino Link configuration, the R2 frame has a 472mm reach, 441mm chainstay length, and 1274mm wheelbase. Stock cockpit components are handled entirely by Bontrager parts which includes the Bontrager Line 35mm bore aluminum handlebar which has a 27.5mm rise and 780mm width. The stem is a Bontrager Line Pro with a 35mm bore clamp and 50mm length. Finally, hand comfort is handled by Bontrager XR Trail Elite lock-on grips. On the Trek website there is a helpful Suspension Calculator that provides suspension settings based on rider weight. At the moment, the new Session is not included from the selection of bikes. With limited availability at this time, we would expect Trek to update their website when the new Session is more readily available. For setup purposes during our testing, we installed Sprindrex Springs to fine-tune spring weight for our two test riders. Both the RockShox Select fork and FOX VAN Performance rear shock we rode have only compression and rebound external adjustments. With a few fewer adjustments than the higher-end suspension we are fortunate to ride nowadays, we weren't left with knobs to adjust in hopes of making up for the lack of rider ability.

Sean’s Session 8 Setup

“This bike is gigantic,” was my internal dialog when first crawling on the size R2 Trek Session 8. The cockpit area felt like I had enough room to swim laps across the top tube and I knew some changes were necessary. Even though the 465mm reach was within my preferred sizing, the overall height of the front end put my weight too rearward over the bike. In an effort to feel more balanced and forward, I only ran a 10mm headset spacer under the fork crown and installed my own handlebar. The stock Bontrager Line handlebar was perfect at 780mm wide but just a tad too tall. I installed my go-to DEITY Racepoint handlebar with 25mm rise which helped lower the front end. Combined, these adjustments shifted my weight more forward and allowed me to dig into corners with more confidence. I felt I achieved a balanced fit on the Session 8, which left me more sat into the bike as opposed to riding on top of the bike. The Bontrager Line Pro direct mount stem worked fine for my needs as I prefer a 50mm length stem. However, the Bontrager XR Trail Elite grips were much too thin and after a few laps, my palms were beat up.

Suspension setup on the Session 8 was quite simple thanks to the limited adjustments on the base level fork and shock. I’m quite familiar with the Boxxer Select fork as it’s what I currently ride on my personal Specialized Demo. For setup, I simply carried over my existing settings from my Demo and applied them to the Session 8. My only gripe during setup was the lack of any volume spacers coming stock within the fork. I typically run 2-3 volume spacers and with none installed, noticed poor bottom out support on the final 50% of travel. Small bump sensitivity was spot-on. I chose to run rebound set neutral and compression mostly closed which provided a responsive and planted ride quality on trail. In the rear, I kept the Mino Link flip chip in the 25% progression setting for the duration of testing. After some initial fiddling with the Sprindex spring, I settled on a 440-pound spring weight. This was just under the stock 450-pound spring weight and allowed for a smoother bottom out and more active rear suspension around mid-stroke. For low-speed compression I ran enough damping to keep the shock supple, yet supported, during the initial part of travel and then relied on the progression of the high-pivot design to manage high-speed compression support.

Jason’s Session 8 Setup

Right off the bat I found the Session 8 R2 size fit me super well! When compared to the Pivot Phoenix 29 we tested first this summer, the reach is 5mm longer while chain stay length is only 3mm longer (29-inch rear wheel). Marginal differences yes, but I found myself located more comfortably centered on the Session 8 with plenty of room to maneuver the bike. The stock Bontrager Line handlebar has a rise of 27.5mm which lands just shy of my preferred 38mm (1.5-inches) bar height. To compensate, I added a 5mm spacer under the fork crown and lowered the fork stanchions 8mm in the crowns. Combined, these changes achieved a comfortably higher front end height. The stock bar width of 780mm was also under my preferred 787-790mm width, however, this wasn’t detrimental to my time on the Session 8. Trek does provide almost 30mm of headset spacers to adjust crown height which is convenient during initial setup. Down the road when a desired height is achieved I would likely cut the steerer tube nice and short for aesthetics. The Boxxer Select fork also came with a tall upper crown which provided even more height adjustment, especially when compared to a flat crown. I prefer a 50mm length stem so Bontrager’s Line Pro stem was perfect for keeping my weight balanced over the front wheel. There was also a 5mm stem riser mounted stock on our Session 8. Another nice touch to provide added adjustability when setting up your cockpit. I left the spacer mounted since I was generally raising the front end per my preferences and saw no need to lower the stem. Unfortunately similar to the Phoenix 29, the stock grips on the Session 8 had a harder compound and thin diameter. They were not great.

With a more rear-center riding position I typically find myself running my rear suspension a bit stiffer or with more compression damping than what is recommended. However, the progressive nature of the new Session’s high-pivot design actually left me over-sprung initially. The stock 450-pound spring on the FOX Van performance shock didn’t let me reach full travel and was too harsh on rougher trails. I played around with various spring weights since the Sprindex spring allows for 5-pound increment weight adjustments. Ultimately, I settled on a 430-pound spring weight. This let me reach full bottom out while keeping the rear end active in chattery sections and plenty supported for riding bike park trails. For external shock adjustments, I ran both rebound and compression one click open from neutral. I actually really enjoyed getting to ride base level suspension and was impressed with the performance of both the Boxxer Select fork and FOX VAN Performance rear shock. Despite the limited external adjustment, I felt a comfortable ride quality was achievable and it was nice to have a ‘set-it-and-forget-it” mentality. In the fork, I ran 125 psi with rebound one click open from neutral and low-speed compression one click closed from neutral. For reference, 125 psi is recommended for around 180-pound rider weight. My 168-pound weight should put me in the 118-120 psi range. The added pressure was necessary to keep the fork supported given the limited compression adjustments and lack of volume spacers coming stock in the fork. If I were to spend more time aboard the Session, the addition of 2-3 volume spacers would provide a more supported, progressive feel and allow me to drop pressure down to the recommended amount for my rider weight.

The Session's High-Pivot Design Is Bred For Pure Downhill Racing

Trails Ridden 

All testing on our Session 8 was split between The Basin Gravity Park and Tamarack Ski Resort. Both bike parks are close to our home base of Boise, Idaho, and offer a variety of trails between them. The Basin is mostly machine-built trails with countless flowing berms and jumps featuring an average higher speed. There is a great, short, rocky downhill trail called G19 that is prime for smashing. In contrast, Tamarack is mostly raw, single track with limited built-up features. It offers some properly rough, technical, and rocky descents. Summer weather brings dry, dusty mountain soil so trail conditions were dry, dusty and loose with most test days reaching 90-degrees Fahrenheit.

Sean's Impressions  

What a machine! The new Trek Session 8 rides like a purebred race bike built to maintain traction, handle heavy impacts and accelerate through the roughest bits of trail. My favorite characteristic of the new high-pivot design was the minimal trail feedback felt through my feet and ankles. With the idler pulley basically eliminating pedal kickback, my feet remained unfazed through chunky rock gardens or heavy compressions. Trek’s ABP design really enables the rear suspension to remain fully active under braking forces, resulting in a very settled and composed feel. The rearward axle path did wonders for maintaining and generating forward momentum despite harsh compressions. At times the speed carried through rough sections due to the suspension design actually required an altered approach to my braking points. On multiple occasions I found myself trail-braking (feathering the rear brake) in loose rock gardens to stabilize the Session 8. Cornering took time to perfect as the growth in overall wheelbase when compressing into a turn is a unique feeling. A phenomenon which occurs that any high-pivot design, I did struggle to get my weight over the front wheel as desired. The Bontrager G5 front tire also did not provide any help when fighting for traction. Watch the video to see me hit the ground like a sack of potatoes for proof!  

2021 trek session 9.9 29

Is the Session 8 my top choice for my next bike park slayer? No, however I’m no Kade Edwards. The nature of the high-pivot design puts the Session 8 into the racehorse category for me. On flowy, jump riddled trails the performance could be described as the antonym of playful. Stability is plentiful but the Session 8 was reluctant to cut shapes into the dirt at my command. Sizing down to a medium frame and running a 27.5-inch rear wheel would likely increase the fun factor. But for me, the Session 8 is best suited on pure downhill tracks. If ridden in a race setting, I would choose the R2 size with mixed wheel configuration to best blend maneuverability and stability at speed.

Jason's Impressions  

I actually have a short history with Trek’s Session downhill bike having raced one in 2012 and 2015. In 2012 I raced for the Trek/ODI Satellite Team which was managed by Rich Houseman and Aaron Gwin. I was teammates with standouts Charlie Harrison and Shane Leslie who both have had successful racing careers and are back aboard Trek bikes in 2021. At that time I was 17-years old and my 26-inch, aluminum Session 8 was the sickest bike I had ridden to date. Of course my knowledge of what separates bikes from one another was limited back then but I vividly remember riding with a new level of confidence on the Session. In 2015 I purchased a pre-production aluminum 27.5-inch test mule Session from a Trek test team. With a few years of racing experience at that point, the most memorable aspect of that Session was how predictable and adaptable its four bar linkage felt. It was a joy to toss around down flow trails and never held me back when between the tape. It’s actually the only downhill bike I’ve kept over the years as it was hand welded in Wisconsin.

2021 trek session 9.9 29

Needless to say, I was excited to try out the new Session design and see how it compared to the platform I’d ridden in the past. The most immediate difference and standout characteristic of the 2021 Session is how stable and composed it remains in rough, repetitive compressions. The high-pivot design truly reigns supreme when sections of trail should overpower the abilities of the bike. On countless occasions, I braced for impact entering chunky rock gardens but would exit almost unfazed with minimal forces transferred through to my body. The Session 8 has an impressive ability to remain level and composed no matter how square a compression you encounter. This characteristic was incredibly confidence-inspiring and kept my riding position centered despite variations in trail pitch or features. The ability of the rear wheel to essentially get out of the way and absorb impacts helped maintain forward momentum with no sensation of being hung up. At speed, the Session 8 never danced or twitched under me from small bump chatter. Again, with a rearward axle path comes wheelbase growth as you progress through travel which benefits overall stability. It’s been talked about plenty in the past, but Trek’s ABP design successfully kept the suspension active and engaged with the ground under braking. Another factor benefiting control and stability, we noticed this most on steep trails where braking points and traction were crucial.

2021 trek session 9.9 29

Hands down, the Session 8 takes the top spot when it comes to managing rough, raw sections of trail. With that said, it is not my first choice to rack up frequent flyer miles. The previous Session was evenly split between bike park ripper and downhill race steed. The new Session now leans heavily towards maximizing composure at speed and leaves a bit to be desired when riding flow trails. Some riders will likely enjoy this stability when tackling new, bigger jump lines with added confidence. However, for those looking to pop off trailside jibs or get sideways on every jump, big or small, it’s going to take some real effort to make the Session 8 cooperate.

I rode our Session 8 with dual 29-inch wheels and mixed 29-inch front, 27.5-inch rear wheel configuration. With the smaller 27.5-inch rear wheel installed, I did notice improved maneuverability while cornering. In tight turns or back-to-back berms, I could whip the Session 8 around on a tighter turning radius than with a 29-inch rear wheel. This improved the fun factor when riding flow trails, being able to wind up the bike and slap corners recklessly. At speed or in technical sections of trail, I never noticed any lack of stability or increased rear wheel hang up. If anything, the smaller wheel gave the sensation of sitting deeper in the bike which helped me drop my heels for an improved riding position. What’s the bottom line on the mixed wheel option? If I was taking the Session 8 racing I would show up with dual 29-inch wheels every time. But for a weekend of ripping party laps with friends, I would toss on the 27.5-inch rear wheel to keep things quick and fun.

Rear Suspension Performance

Sean's Impressions

2021 trek session 9.9 29

The rearward axle path of the Session's new high-pivot design manages rough compressions with exceptional finesse. It almost defies physics when you topple over a harsh bump and feel like you have sped up from the impact. Even though the platform is fairly progressive I never experienced any harsh bottom outs or limitations achieving full travel. We left our Session 8 in the 25% progression rate setting during testing as I never felt the need to lean towards more of a plush setup. However, I love the fact that Trek provides riders this extra level of adjustability if a smoother ride profile is desired. As mentioned above, I experienced absolutely no pedal kickback due to the idler pulley but did notice some lost pedaling efficiency. The idler functioned flawlessly and created a silent ride, however adding an extra moving bearing undeniably increases drag. When combined with the higher weight of the Session 8 it did take a few additional stomps on the pedals to get up to speed. The FOX VAN Performance shock worked surprisingly well and impressed me with its flawless execution and tuning simplicity. The lack of numerous external clickers made me realize low-speed compression and rebound are plenty sufficient for the majority of riders. Myself included. Unless you are competing at a high level, the addition of multiple shaft rate adjustments can create setup confusion and excuses. If I was looking to upgrade my stock rear suspension I would start with a Sprindex Spring prior to purchasing an aftermarket shock. The cost is significantly less and the additional adjustability is both useful and easy to manage.

Jason's Impressions

2021 trek session 9.9 29

The previous Sessions I rode always felt fairly linear and would have benefited from some added bottom-out resistance. To my satisfaction, from my initial run, it was pretty obvious improvements to ending-stroke support had been made on the new Session. All my test time was spent in the 25% progression Mino Link flip chip setting and I never felt the need to lessen the progression rate. Being on the lighter side, I often rely on pumping the smallest trail features to maintain speed. The mid-to-end stroke support offered with the 25% progression setting comfortably pushed back against my efforts and allowed for speed to be gained from pumping. I was also pleased with how supple the initial stroke remained on the new Session platform in part to the ABP design. A personal favorite characteristic carried over from the previous Session, there was superb traction and small bump compliance. When hitting large compressions, I did not feel the progressive design kept full travel from being achieved or created a harsh ride experience. As mentioned with my initial setup, settling on the correct 430-pound spring weight was key for performance. Big surprise, right? At this spring weight, I could yank to flat off of jumps and trust the shock would reach a comfortable bottom out. And at the same time, this spring weight remained light enough to keep the bike active around mid-stroke where the majority of ride time was spent.

Session 8 29 ‘GX’ Build Kit

Sean's Standout Components: SRAM GX Drivetrain, TruVativ Descendant Cranks,  Bontrager Line DH 30 Wheels 

2021 trek session 9.9 29

My favorite part of the Session 8 build kit was the SRAM GX drivetrain. The GX groupset delivers the same crisp SRAM shifting engagement as XO1 and worked flawlessly for the duration of our testing. I would have a hard time finding a reason to bump up to XO1 components given the performance of GX nowadays. The clutch of the rear derailleur did a phenomenal job limiting excess chain slap and kept the Session 8 rolling quieter than the Shimano Zee derailleur on our Pivot Phoenix 29. The next standout part spec was the TruVativ Descendant DH aluminum cranks. Not that carbon isn’t up to the job of downhill riding, I enjoyed the added peace of mind riding with durable aluminum cranks and enjoyed their stiff compliance. My last standout component on the Session 8 GX build was the Bontrager Line DH 30 wheelset. They took a beating during testing and the rims have absolutely no dents, hops or wobbles to be seen. I also loved the Rapid Drive rear hub which has 108 points of engagement. Our other downhill test bikes have either low-level or unbranded hubs with minimal points of engagement. The crisp buzz of the Rapid Drive hub rolling down the trail was a pleasant addition that made it feel like I was riding an aftermarket wheelset.

Sean's Least-favorite Components: Bontrager G5 Team Issue Front Tire

2021 trek session 9.9 29

My biggest peeve with the Session 8 was Bontrager’s G5 Team Issue tire when used as a front tire. The channel present between the center and side knobs created an unpredictable feel when cornering on loose over hardpack conditions. I had the tendency to begin pushing the front wheel before the side knobs would engage with the ground and would have to put out a foot to counter the front tire slide. As a rear tire, the tight center knobs rolled great and I found the channel between the center and side knobs wasn’t an issue.

Jason's Standout Components: Boxxer Select Fork, FOX VAN Performance Shock 

2021 trek session 9.9 29

Despite the limited external adjustments, both the Boxxer Select fork and FOX Van Performance shock performed well above my expectations. Sure, if I was going to tackle elite level downhill racing again I would make the jump to more expensive and tunable suspension. But for my daily downhill bike, the base level suspension did not hold me back on the trail. The Boxxer’s Charger RC damper is highly refined and provides great initial bump compliance with comfortable mid-to-end stroke support. The Select model uses the same chassis as the top-tier Boxxer Ultimate which offers great torsional stiffness. Lastly, the Maxima damper fluid basically eliminates any seal or stanchion stickiness. My experience with the FOX VAN performance shock was similar. The shock did not hold back the capabilities of the Session 8. Even on quick, harsh compressions I never felt like the shock was being overpowered and the mid-stroke support was a highlight of mine.

Jason's Least-favorite Components: Code RS Brakes, 180mm Rear Rotor

2021 trek session 9.9 29

My biggest complaint with the Session 8 was the 180mm rear rotor. With most downhill riders running 200-220mm rotors I’d expect Trek to at least spec the Session 8 with 200mm rotors front and rear. I don’t think I’m alone when I admit I use more rear brake than front during a day of downhill laps. The smaller, 180mm rear rotor managed heat poorly and caused our Session 8 test bike to burn through the rear pads at a much faster rate than the front pads. This resulted in a large difference in lever throw between our front and rear Rode R brakes. This was problematic since Code R brakes lack a pad contact adjustment. To compensate, I was forced to move the rear lever further out from the bar to maintain a consistent bite point.

2021 trek session 9.9 29

What noise? The Session 8 is undoubtedly the quietest bike in our Summer of Downhill test fleet. Some of our test bikes were obviously specced with low-end derailleurs in an effort to save cost. Not the case with the Session 8. The SRAM GX DH 7-speed drivetrain not only functioned flawlessly but was impressively silent with almost no chain slap to be heard. Aiding in deadening any drivetrain rattle was the idler pulley and ribbed chain slap frame protection. There were no areas of noise concern on the rest of our Session 8. The internally routed cables fit snug into the frame ports and with a few extra points of rear hub engagement, there was no freehub knock or play. A standout aspect of the new Session platform, we don’t expect our Session 8 to start talking back anytime soon.

Coming in at $4,999 USD the Session 8 29 GX build provides riders with a race-ready package. All the components are appropriate and ready to take on countless days of shredding right out of the box. There is also the added value of having multiple frame adjustments and the option to run different wheel sizes, making the Session 8 multiple bikes in one. When discussed between our two testers, they felt committing to the two thousand dollar price jump for the highest tier, Session 9 XO1 build at $6,999 USD wasn’t worth the bacon. The difference is an upgrade to higher-end SRAM X01 drivetrain, SRAM Code RSC brakes, RockShox Boxxer Ultimate fork, and Super Deluxe Ultimate air rear shock. Looking into the future for our own test Session 8, the only immediate changes we would make would be bolting on a 200mm rear rotor and installing higher-end brakes with pad contact adjust. All remaining components function wonderfully and we would opt to upgrade other components as typical wear and tear intervals present themselves. Another big factor adding value to the Session 8 is Trek’s extensive dealer network. The ability to have assistance with maintenance and troubleshooting problems is a huge benefit to shopping with a box brand like Trek. While some consumer-direct brands do offer similar builds with a lower price tag, riders will have to weigh if they feel comfortable taking on maintenance without dealer-level support.

What's The Bottom Line?

Trek had no reason to redesign their Session downhill bike after years of proven success. But when racing at the highest level, the search for saved time never halts. Luckily for downhill riders worldwide, the new platform only elevates the already successful Session pedigree. The high-pivot suspension layout in conjunction with Trek’s ABP design provides the best of both worlds with supple, small bump compliance, and controlled bottom-out resistance. The rearward axle path scoffs at square edge hits and allows the Session 8 to carry better speed than most bikes out there. With geometry and progression adjustments, size-specific chainstays, dual 29-inch, 27.5-inch and mixed wheel options possible - the Session is multiple bikes packaged into one. To top things off, the Session 8 build offers riders a complete build that is both lighter on their wallet and laced with quality, race-ready components. While the past Session design was synonymous with trail-bike-esque weight possibilities, the Session 8 tips the scales and doesn’t try to hide its full aluminum frame. Boosting jumps and slapping berms aren’t going to come easy as the Session 8 was developed to maximize speed in a straight line. But with the right setup, we believe most riders will be able to swing a leg over the Session 8 and enjoy multiple seasons of downhill laps.

For more information on Trek’s Session lineup, head over to www.trekbikes.com

To view key specs and compare bikes, head over to the Vital MTB Product Guide

About The Testers

Jason Schroeder  -  Age: 26 // Years Riding MTB: 15 // Height: 6' (182cm) // Weight: 168-pounds (76.2kg)

A once-upon-a-time World Cup downhill racer turned desk jockey, Jason has spent years within the bicycle industry from both sides of the tape. A fan of all day adventures in the saddle or flowing around a bowl at the skatepark, he doesn't discriminate from any form of two wheel riding. Originally a SoCal native now residing in Boise, Idaho, you can find Jason camped out in his van most weekends at any given trailhead in the greater Pacific NorthWest.

Sean McClendon  -  Age: 36 // Years Riding: 21 // Height: 5'10" (177cm) // Weight: 190-pounds (86.2kg)

"Griz" is a battered veteran of MTB gravity racing. Following a major crash during the 2010 USA National Championship Pro downhill race, he put in the hours and fought his way back to health and the fun that is two wheels. Griz has ridden for a number of the USA's top teams throughout his racing career, testing prototype frames and components along the way. Currently managing US Dealer sales and the Fresh Blood amateur development team at DEITY Components, he remains motivated by the mantra "whips don't lie." You'll often find him perfecting his high-flying sideways aerial maneuvers while living the #pinelife in Idaho.


View replies to: $4,999 high-pivot trek session 8 review - vital's summer of downhill.

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Trek Session 9.9 29

  • AUS $ NZD $ USD $ CAD $ GBP £ EUR €

Weight / M - 15.27 kg / 33.67 lbs (with tubes)

At a glance

Session 9.9 is the pinnacle of downhill mountain bike performance. This is the same DH bike the pros ride, and it’s built for one reason: going as fast as freakin’ possible down hills. It pairs a SRAM X01 DH drivetrain and Code RSC brakes with our premium OCLV Mountain Carbon frame and RockShox suspension with super-fast 29″ wheels.

Where To Buy

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  • Frame OCLV Mountain Carbon main frame & stays, tapered head tube, integrated frame protection, Control Freak internal routing, magnesium rocker link, Mino Link, ISCG mount, ABP, 12x157mm thru axle, 190mm travel
  • Fork RockShox Boxxer Ultimate, DebonAir spring, Charger 2 RC2 damper, straight steerer, 46mm offset, Boost, 110x20mm Maxle Stealth, 190mm travel
  • Shock RockShox Super Deluxe Ultimate DH, 225x70mm
  • Wheels Front: Bontrager Line DH 30, Tubeless Ready, 6-bolt, 110x20mm Boost thru axle Rear: Bontrager Line DH 30, Tubeless Ready, 6-bolt, Shimano 7 speed freehub, 157x12mm thru axle
  • Wheel Size 29"
  • Tires Bontrager G5 Team Issue, wire bead, 2-ply 60 tpi, 29x2.50''
  • Chain SRAM PC-1110, 11 speed
  • Crank SRAM X01 DH, DUB 83, 36T, 165mm length
  • Bottom Bracket SRAM DUB, 83mm, BSA threaded
  • Rear Derailleur SRAM X01 DH
  • Shifters SRAM X01 DH, 7 speed
  • Brakeset SRAM Code RSC hydraulic disc
  • Saddle Bontrager Arvada, austenite rails, 138mm width
  • Seatpost Bontrager Rhythm Elite, 31.6mm, 0mm offset, 330mm length
  • Stem Bontrager Line Pro, 35mm, Direct Mount, 50mm length

Q: How much is a 2020 Trek Session 9.9 29?

A 2020 Trek Session 9.9 29 is typically priced around $8,000 USD when new. Be sure to shop around for the best price, and also look to the used market for a great deal.

Q: Where to buy a 2020 Trek Session 9.9 29?

The 2020 Trek Session 9.9 29 may be purchased directly from Trek .

Q: How much does a 2020 Trek Session 9.9 29 weigh?

A 2020 Trek Session 9.9 29 weights M - 15.27 kg / 33.67 lbs (with tubes).

Q: What size wheels does the 2020 Trek Session 9.9 29 have?

The 2020 Trek Session 9.9 29 has 29" wheels.

Q: What size 2020 Trek Session 9.9 29 should I get?

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2021 trek session 9.9 29

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Trek Session 9.9 29

This 2021 Trek Session 9.9 29 - SRAM X01 has a frame size M. The bike suitable for a rider height of 5 ' 4 " - 5 ' 10 ".

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Trek - Session 9.9 29, 2021

Session 9.9 29

$ 4,585 $ 8,945

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  • Trek Session 9.9 29 2021

Trek Session 9.9 29 2021

Bike summary

Bike components.

OCLV Mountain Carbon main frame & stays, tapered head tube, integrated frame protection, Control Freak internal routing, magnesium rocker link, Mino Link, ISCG mount, ABP, 12x157mm thru axle, 190mm travel

Suspension Fork

RockShox Boxxer Ultimate, DebonAir spring, Charger 2 RC2 damper, straight steerer, 46mm offset, Boost, 110x20mm Maxle Stealth, 190mm travel

RockShox Super Deluxe Ultimate DH, RC damper, 225mm x 70mm

Rear Derailleur

SRAM X01 DH, medium cage

Shift Levers

SRAM X01 DH, 7 speed

SRAM PG-720, 11-25, 7 speed

SRAM X01 DH, DUB 83, 36T, 56.5mm chainline, 165mm length

Bottom Bracket

SRAM DUB, 83mm, BSA threaded

SRAM PC-1110, 11 speed

Bontrager Line DH 30, Tubeless Ready, 6-bolt, 110x20mm Boost thru axle

Bontrager G5 Team Issue, wire bead, 2-ply 60tpi, 29x2.50''

SRAM Code RSC 4-piston hydraulic disc

Disk Rotors

Size: S, M, L, XL, SRAM CenterLine, 6-bolt, round edge, 180mm; Size: S, M, L, XL, SRAM CenterLine, 6-bolt, round edge, 200mm

Bontrager Line Pro, 35mm, Direct Mount, 50mm length

Bontrager Line Pro, OCLV Carbon, 35mm, 15mm rise, 820mm width

Bontrager XR Trail Elite, alloy lock-on

Bontrager Arvada, austenite rails, 138mm width

Bontrager Rhythm Elite, 31.6mm, 0mm offset, 330mm length

Bike geometry

Model overview.

Session 9.9 29 completes the Trek Session model. 88 bikes variations carry this model name so far. Take a sneak peek at all Trek Session bikes models from 2021 , by clicking here .

Model range prices

Trek Session 8 27.5 2021 is the cheapest bike model and costs 4799 $ . Trek Session 9.9 29 2021 is the most expensive one and costs 7999 $ .

Make sure you wear a helmet on every ride, and that your bike performs well. In short, this means checking the tires, brakes, and chain to make sure everything is in good working order.

Average price for Downhill bikes

If you want an acceptable Downhill bike you should know that the average price is 3391 $ . However, even if your budget is less than the average, you might still be able to get a top-quality Downhill bike. To sum up, when you purchase your bike, make sure to check if it has reviews, and also do some components research.

At the moment of the release date, Trek Session 9.9 29 price was 7999 $ . Comparing this to the average Downhill bike price, we see that the price is 135.89 % more expensive .

Downhill bikes average weight

If we make a quick analysis of the average weight of a Downhill bike, we get 15.89 kg (35.03 lbs) . Having an easier bike than average will give you a great advantage on climbs. However, a heavier bike will gain more speed on descends.

Session 9.9 29 weighs 15.27 kg (33.66 lbs) and is slightly lighter than the average. In conclusion, the average Downhill bike weighs 4.06% more than Session 9.9 29.

Internal Cable Routing

Moreover, this bike comes with internal cable routing allowing you to keep the cables in a good condition. It also makes it look more professional.

Overview of components

Trek Session 9.9 29 2021 bike is equipped with the RockShox BoXXer Ultimate fork, and has 190mm travel. Bike forks are great for shock absorption and provide you with a smooth ride. In short, you should always ensure you have a good fork when purchasing a bike.

As for the rear shock, this bike has the RockShox Super Deluxe Ultimate DH model, with a travel of 190mm . Bike rear shocks increase the riding comfort, and also give you more control over technical trails. To sum up, get a full-suspension bike if you want the smoothest rides.

Wheels size

The Session 9.9 29 2021 bike is equipped with 29″ aluminum wheels when leaving the factory. Having 29″ wheels means that you need less fork travel, leading to a reduction of the pedal bob effect. However, the 29″ wheels will add a little more weight to the bike itself.

When you want to stop the bike in time, the brakes are vital. The Session 9.9 29 has Hydraulic Disc brakes. Hydraulic disc brakes are perfect for mountain biking, road cycling, and commuting. To sum up, your safety is in good hands.

Trek Session models from 2024

Trek session models from 2023, trek session models from 2022, trek session models from 2021, trek session models from 2020, trek session models from 2019, trek session models from 2018, trek session models from 2017, trek session models from 2016, trek session models from 2015, trek session models from 2014, trek session models from 2013, trek session models from 2012, trek session models from 2011, trek session models from 2010, trek session models from 2009, trek session models from 2008, trek session models from 2007, trek session models from 2006, trek session models from 2005.

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Results have arrived, trek session 9.9 29 downhill bike - 2020, small, item #bmt24957, condition: certified pre-owned what's this, fit range: 5'2" - 5'5" sizing guide, every certified pre-owned bike passes our multi-point inspection.

  • Frame integrity verified
  • All components inspected
  • Drivetrain cleaned and tuned
  • Suspension adjusted
  • Wheels trued

Our RideFast shipping means this bike gets to you quickly and securely. Domestic US ground rates are a flat $135 for regular bikes or $150 for e-bikes.

Quick Assembly

  • Bikes arrive tuned and mostly pre-assembled
  • Torque tool & video guide included
  • Get riding in 15 minutes

Canadian Customers

Please note that any duties, taxes, or surcharges as required by Canadian customs and provincial authorities will be the buyer's responsibility. Shipping to Canadian addresses may take longer than expected due to customs.

Guaranteed Buyback

We'll happily purchase this bike back from you when you're ready for your next upgrade. A TPC buyback offer is guaranteed for 18 month on all qualifying bikes.

30-Day Returns

If this bike isn't perfect for you, our Ride Guides will help you find the right one.

Iconic Downhill Machine

If you follow downhill racing, the Session doesn’t need an intro. It was the winningest bike on the DH World Cup circuit in 2021. Built to be fast, jump, and dominate the track, the Session is a full-fledged DH bike ready for anything.

  • RockShox Ultimate suspension is plush & supportive.
  • New Specialized Eliminator front & rear tires for grip in all conditions.
  • New shifter cable & housing, pro-tuned to optimize crisp shifting.
  • Curious about one of the biggest perks of buying with TPC? Read about our Guaranteed Buyback Program . It comes standard with every bike we sell.
  • Small scratches on the drive side chainstay.
  • Moderate scratches on the inside of the non-drive side seatstay.
  • Moderate paint chip on the drive side seatstay.
  • Small scratches on the non-drive side chainstay, down tube, & rims.

Added to Cart

2021 trek session 9.9 29

Inspected. Tested. Trusted.

What is cpo.

CPO bikes are gently ridden bikes that have been meticulously inspected, restored and serviced. Every CPO bike is cleaned, tuned and tested in our top-of-the-line Colorado headquarters. Road, mountain, ebike or gravel, TPC services each bike over 8 phases and multiple points of inspection.

Bikes are meant to be used.

Ask a Ride Guide about this

Sizing guide.

The chart below provides a general suggested range of heights and is not exact. Sizing may vary across brands.

The tailoring of any bike is an important step in the long term enjoyment of riding and it can take time to adjust to the fit of a new bike. All contact points (pedals, shoes, and saddle) can be changed and altered for personal preference, performance, and comfort.

Contact our Ride Guides if you have any questions about the fit of your new bike.

866.401.9636 - Contact the Ride Guides

Purchase your next bike with the same confidence you would when buying new. We scrutinize age, condition, and quality. If a bike meets the standard, our pro tune and service will guarantee that your ride will be in pristine condition when it arrives at your door.

2021 trek session 9.9 29

  • Rider Notes

2019 Trek Session 9.9 29

2021 trek session 9.9 29

A 29″ carbon frame full suspension downhill bike with high-end components. Compare the full range

For This Bike

View more similar bikes →

Based on frame geometry and build specs.

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Session 9.9 29

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Add custom gearing

Mountain Bike Action

Mar 2019 · McCoy

Faster than a speeding bullet

Read Review

Loam Wolf

Nov 2018 · Drew Rohde

A review worth reading if you are considering a 29er DH bike. The Trek Session 9.9 downhill bike has a couple interesting quirks but is without a doubt one of the best DH bikes we've ridden in. If you're a racer looking for pick up speed and drop seconds, check this bike out!


Oct 2018 · Paul Aston

One of the most successful, recognizable silhouettes on the DH circuit now comes with wagon wheels. So how does it compare to the newest crop of DH bikes?

Ultra light and stiff

Exceptional, simple finish

Balanced, aggressive geometry

Quick acceleration and efficient pedaling

Possibly too light and stiff

Top of the line price tag

Lacking traction in rough stuff

Reach may limit taller riders


Sep 2018 · Seb Stott

A pricey bike let down by a basic fork, disappointing brakes and dated geometry

‘ABP’ rear suspension provides a solid, supple action

Relatively short front end feels cramped, high bottom bracket and short frame deliver a sometimes precarious-feeling ride, harsh fork and weak brakes are disappointing for the price


If you're a DH racer, your special edition bike usually comes out during worlds - if you're good enough to qualify and your bike sponsor loves you.


May 2017 · Matt Phillips

All new carbon framesets for both 27.5 and 29 inch wheels for Trek's downhill race bike

BIKE Magazine

Trek releases the 2018 Session with updated geometry, refined linkage, and a revamped Float X2 shock. There's also a 29 inch version, which the internet will probably have nothing to say about.

May 2017 · Smurf

The world's first production, carbon 29er downhill bike

99 Spokes on YouTube

Last updated September 16 Not listed for 1,589 days

Trek Session 9.9 29 2020

Trek Session 9.9 29 2020

About the Trek Session 9.9 29 2020

The Trek Session 9.9 29 2020 is a Full suspension Downhill Mountain Bike with a carbon frame. Equipped with a SRAM X01 drivetrain of 7 gears (1x7). Its features include internal routing, boost 110 , and e-thru axle. The bike weighs approximately 15,27 kg.

Internal routing

E-thru axle, hydraulic disc brakes, tapered head tube, tubeless ready, specifications, subscribe to our newsletter.

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  1. Trek Announces New 29er Session 9.9 DH Bike

    2021 trek session 9.9 29

  2. 2021 Trek Session 9.9 29

    2021 trek session 9.9 29

  3. 2021 TREK Session 9.9 29 Large For Sale

    2021 trek session 9.9 29

  4. Trek Session 9.9 29er is an absolute rocket ship if you're looking for

    2021 trek session 9.9 29

  5. Review: Trek Session 9.9 29

    2021 trek session 9.9 29

  6. 2021 Trek session 9.9 For Sale

    2021 trek session 9.9 29


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  6. Trek Session 9.9 en test avec Brett Rheeder


  1. Session 9.9 29

    2020-2021 Session 9.9 29 1 Reviews / Write a Review Model 592257 Retailer prices may vary. Session 9.9 is the pinnacle of downhill mountain bike performance. This is the same DH bike the pros ride, and it's built for one reason: going as fast as freakin' possible downhill.

  2. 2021 Trek Session 9.9 29

    The 2021 Trek Session 9.9 29 is an Downhill Carbon mountain bike. It sports 29" wheels, is priced at $7,999 USD, comes in a range of sizes, including SM High, SM Low, MD High, MD Low, LG High, LG Low, XL High, XL Low, has RockShox suspension and a SRAM drivetrain. The bike is part of Trek 's Session range of mountain bikes. Where To Buy Trek

  3. Session

    Raking in thirteen World Cup DH gold medals, Session takes the cake as the winningest race bike of 2021. With plenty of gold medals under its belt, it's no surprise Session earned the title as the fastest downhill ride of the year from both Pinkbike and Global Mountain Bike Network. All speed, no hangups Session's high-pivot suspension design

  4. 2021 Trek Session 9.9 29

    2021 Trek Session 9.9 29 - Specs, Comparisons, Reviews - 99 Spokes 2021 · Trek Session 9.9 29 A 29″ carbon frame full suspension downhill bike with ultra high-end components. Compare the full range Terrain Handling View on trekbikes.com Learn about Trek Report data problem Add to Comparison Where to Buy Similar Bikes For This Bike Accessories

  5. Review: Trek Session 9.9 29

    Session 9.9 29" Details Intended use: downhill Travel: 190mm rear / 190mm front Wheel size: 29" Frame construction: OCLV Mountain Carbon frame with magnesium Evo rocker link Fork: Fox 49...

  6. Bike Test: Trek Session 9.9 29

    The Session 9.9 is a purebred race bike equipped with nothing but the best. Starting with its suspension, we see a 190mm-travel Fox Factory 49 fork, which builds off the popular Fox 40; however, the arch is modified to allow clearance for a taller wheel. In back, Trek spec'd a 2019 Fox Factory Float X2 with a new mechanical bottom-out bumper ...

  7. Session 9.9 29

    2020-2021 Session 9.9 29 Model 592257 Retailer prices may vary. Session 9.9 is the pinnacle of downhill mountain bike performance. This is the same DH bike the pros ride, and it's built for one reason: going as fast as freakin' possible downhill.

  8. Trek Session 9.9 29 2021

    The Trek Session 9.9 29 2021 has a gear ratio of 3,28 downhills. This means that for every 1 turn of the pedals at the front, the back wheel turns 3,28 times. The higher this value, the better is the bike performance downhills.

  9. Fastest Bike on the mountain TREK Session 9.9 29 2021 bike review

    Fastest Bike on the mountain TREK Session 9.9 29 2021 bike review Session 9.9 is the pinnacle of downhill mountain bike performance. This is the same DH bike...

  10. Trek Session 9.9 29

    The Session 9.9 29er is race-ready and boasts a 7-speed Shimano Saint drivetrain and Shimano Saint brakes. A particular highlight I enjoy is the very sexy MRP G4 carbon chainguide. Rolling stock on the Trek Session 9.9 29 comes in the form of Bontrager Line DH 30 wheels, with Boost 110×20/157x12mm spacing.

  11. 2020 Trek Session 9.9 29 Bike

    Specifications Product Trek Session 9.9 29 Bike Model Year 2020 Riding Type Downhill Freeride / Bike Park Rider Unisex Sizes and Geometry SM (high, low) MD (high, low) LG (high, low) XL (high, low) View Geometry Wheel Size 29" Frame Material Carbon Fiber Frame Material Details

  12. Trek Session 9.9 29 Downhill Bike

    It was the winningest bike on the DH World Cup circuit in 2021. Built to be fast, jump, and dominate the track, the Session is a full-fledged DH bike ready for anything. ... Trek Session 9.9 29 Downhill Bike - 2020, Medium Or Schedule a Time to Chat. Sizing Guide.

  13. 2021 Trek Session C 29 Frameset

    2021 TrekSession C 29 Frameset A 29″ carbon frame full suspension downhill frameset. View on trekbikes.com Learn about Trek Report data problem Add to Comparison Where to Buy Similar Bikes For This Bike Accessories Top Comparison View more similar bikes → Reviews The New 2022 Trek Session Apr. 2021

  14. $4,999 High-Pivot Trek Session 8 Review

    Trek states the change in material was driven by their World Cup riders' feedback and need for more frame compliance. This decision resulted in a nearly 4-pound weight difference between the previous top tier Session 9.9 29 (33.67-pounds/15.27kg) and the 2021 Session 9 X01 (37.65-pounds/17.08kg).

  15. 2021 Trek Session 9.9 29

    2021 · Trek Session 9.9 29. A 29″ carbon frame full suspension downhill bike with ultra high-end components. Compare the full range. RRP: 7.999 $ ...

  16. Session 9.9 29

    2020-2021 Session 9.9 29 1 Reviews / Write a Review Model 592260 Retailer prices may vary. Session 9.9 is the pinnacle of downhill mountain bike performance. This is the same DH bike the pros ride, and it's built for one reason: going as fast as freakin' possible downhill.

  17. 2020 Trek Session 9.9 29

    Specifications Related Discussion 2020 Trek Session 9.9 29 Downhill Compare SHARE Weight / M - 15.27 kg / 33.67 lbs (with tubes) Manufacturer Website At a glance The 2020 Trek Session 9.9 29 is an Downhill Carbon mountain bike. It sports 29" wheels, is priced at $8,000 USD, has RockShox suspension and a SRAM drivetrain.

  18. Trek Session 9.9 29 used in M

    Buy a pre-owned Trek Session 9.9 29 2021 at buycycle - Striving to be the world's largest marketplace for used bikes. Up to 70% off.

  19. Trek Session 9.9 29

    Session 9.9 is the pinnacle of downhill mountain bike performance. This is the same DH bike the pros ride, and it's built for one reason: going as fast as freakin' possible downhill. It pairs a SRAM X01 DH drivetrain and Code RSC brakes with our premium OCLV Mountain Carbon frame and top-sh

  20. Trek Session 9.9 29 2021

    Trek Session 9.9 29 2021 Bikes Mountain Downhill Trek 2021 Estimate price | 7,999 USD Weight | 15.27 kg Compare Bike summary Category Mountain | Downhill Frame Carbon Wheels 29" Travel Front 190mm Travel Rear 190mm Fork RockShox BoXXer Ultimate Groupset X01 Suspension Full Drivetrain 1 × 7 Brakes Hydraulic Disc Bike components Frame Frame

  21. Trek Session 9.9 29 Downhill Bike

    Shop the Trek Session 9.9 29 Downhill Bike - 2020, Small at The Pro's Closet! Find the largest selection of CERTIFIED Pre-Owned bikes, all of which undergo a 141-point inspection and come with our Guaranteed BuyBack program! ... It was the winningest bike on the DH World Cup circuit in 2021. Built to be fast, jump, and dominate the track, the ...

  22. 2019 Trek Session 9.9 29

    The Trek Session 9.9 downhill bike has a couple interesting quirks but is without a doubt one of the best DH bikes we've ridden in. If you're a racer looking for pick up speed and drop seconds, check this bike out! ... First Look: 2018 Trek Session 29 and 27.5. May 2017. Trek releases the 2018 Session with updated geometry, refined linkage, and ...

  23. Trek Session 9.9 29 2020

    About the Trek Session 9.9 29 2020. The Trek Session 9.9 29 2020 is a Full suspension Downhill Mountain Bike with a carbon frame. Equipped with a SRAM X01 drivetrain of 7 gears (1x7). Its features include internal routing, boost 110 , and e-thru axle. The bike weighs approximately 15,27 kg.