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It's right for you if...
You want our fastest downhill bike, with the speed of 29˝ wheels and the stability of a full-on DH frame. You seek out the fastest lines and the biggest jumps. You like to dial in your ride, and want the ability to fine-tune your suspension, fit and handling on a bike that makes no compromises.
The tech you get
A full OCLV Mountain Carbon frame, 190mm RockShox Boxxer Ultimate fork with a plush DebonAir spring for better small bump compliance, 190 mm of rear travel with a RockShox Super Deluxe Ultimate DH shock, 29er Bontrager Line DH 30 wheels, SRAM X01 DH drive train, SRAM Code RSC brakes and a Bontrager Line Pro OCLV carbon handlebar.
The final word
Best frame, best suspension, best parts and fast-rolling 29˝ wheels. Session 9.9 is the fastest bike on the mountain, even when that mountain is a stop on the World Cup circuit.
See it in action
favorite_borderWhy you'll love it
- It's like a precision wrecking ball that lives for tearing down mountains and taking the fastest, burliest lines
- The fastest runs demand the most dialled set-up: the air shock and fork on Session 9.9 are adjustable and easy to fine-tune for different tracks
- Mino Link and fixed-angle headset cups let you adjust your geometry for your personal handling requirements
Features
Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.
Trek's mountain-specific carbon fibre is tougher carbon, with unique materials and lay-up procedures, Trek's advanced engineering, and a higher standard of testing.
Learn more
Looks like a World Championship
Trek Factory Racing's Reece Wilson charged his way into the rainbow jersey aboard Session this year, taking all the right risks on a slick course and carving his name in Downhill's history books with a truly gutsy run.
Watch the winning run
Suspension Calculator
This suspension calculator will help you optimise your suspension settings for your riding weight. Simply follow the steps to find your best set up.
Learn more
Mino Link adjustable geometry
Fine tune head tube angle by 1/2° and BB height by up to 10mm with the simple turn of a nut. Just flip the link to choose between slack or slacker geometry, without negatively affecting suspension performance. A Trek exclusive.
Learn more
Control Freak cable management
The lightest, quietest, most versatile cable management system allows any combination of shift, brake, lockout and dropper post lines to be routed through the frame for clean looks and the ultimate custom set-up.
Down tube guard
Replaceable external shield protects the down tube from trail debris.
Specifications
*spec applies to all sizes unless otherwise noted
| 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, 12x157 mm thru axle, 190 mm travel |
|---|---|
| Fork | RockShox Boxxer Ultimate, DebonAir spring, Charger 2 RC2 damper, straight steerer, 46 mm offset, Boost, 110x20 mm Maxle Stealth, 190 mm travel |
| Shock | RockShox Super Deluxe Ultimate DH, RC damper, 225 mm x 70 mm |
| Max compatible fork travel | 200mm |
| Wheel front | Bontrager Line DH 30, Tubeless Ready, 6-bolt, 110x20 mm Boost thru axle |
|---|---|
| Wheel rear | Bontrager Line DH 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano 7 speed freehub, 157x12 mm thru axle |
| Skewer rear | Bontrager Switch thru-axle, removable lever |
| Tyre | Bontrager G5 Team Issue, wire bead, 2-ply 60tpi, 29x2.50" |
| Max tyre size | 29x2.50" |
| Shifter | SRAM X01 DH, 7-speed |
|---|---|
| Rear derailleur | SRAM X01 DH, medium cage |
| Crank | SRAM X01 DH, DUB 83, 36-T, 165 mm length |
| Bottom bracket | SRAM DUB, 83 mm, BSA threaded |
| Cassette | SRAM PG-720, 11-25, 7-speed |
| Chain | SRAM PC-1110, 11-speed |
| Pedal | Wellgo MG-1, magnesium body, Cro-Mo axle, replaceable pins |
| Max. chainring size | 36T |
| Saddle | Bontrager Arvada, austenite rails, 138 mm width |
|---|---|
| Seatpost | Bontrager Rhythm Elite, 31.6 mm, 0 mm offset, 330 mm length |
| Handlebar | Bontrager Line Pro, OCLV Carbon, 35 mm, 15 mm rise, 820 mm width |
| Grips | Bontrager XR Trail Elite, alloy lock-on |
| Stem | Bontrager Line Pro, 35 mm, Direct Mount, 50 mm length |
| Brake | SRAM Code RSC hydraulic disc |
| *Brake rotor |
Size:
S, M, L, XL SRAM CenterLine, 6-bolt, round edge, 180 mm |
|
Size:
S, M, L, XL SRAM CenterLine, 6-bolt, round edge, 200 mm |
| Weight | M - 15.27 kg / 33.67 lb (with tubes) |
|---|---|
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb). |
Sizing & fit
Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorised retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.
Rider Height
Inseam
S
153.0 - 166.5 cm
5'0.2" - 5'5.6"
72.0 - 79.0 cm
28.3" - 31.1"
M
161.0 - 175.0 cm
5'3.4" - 5'8.9"
76.0 - 82.0 cm
29.9" - 32.3"
L
174.0 - 188.0 cm
5'8.5" - 6'2.0"
82.0 - 88.0 cm
32.3" - 34.6"
XL
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
All measurements provided in cm unless otherwise stated.
| Frame size letter | Geometry position | Wheel size | A — Seat tube | B — Seat tube angle | C — Head tube length | D — Head angle | E — Effective top tube | F — Bottom bracket height | G — Bottom bracket drop | H — Chainstay length | I — Offset | J — Trail | K — Wheelbase | L — Standover | M — Frame reach | N — Frame stack |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S | High | 29" | 42.5 | 57.0° | 11.5 | 62.6° | 56.8 | 35.6 | 1.6 | 45.2 | 5.8 | 12.8 | 122.8 | 74.1 | 40.0 | 61.6 |
| M | High | 29" | 42.5 | 57.0° | 11.5 | 62.6° | 58.7 | 35.6 | 1.6 | 45.2 | 5.8 | 12.8 | 124.7 | 74.2 | 42.0 | 61.6 |
| L | High | 29" | 45.6 | 57.0° | 11.5 | 62.6° | 60.8 | 35.6 | 1.6 | 45.2 | 5.8 | 12.8 | 126.8 | 74.7 | 44.0 | 61.6 |
| XL | High | 29" | 45.6 | 57.0° | 11.5 | 62.6° | 63.3 | 35.6 | 1.6 | 45.2 | 5.8 | 12.8 | 129.3 | 74.9 | 46.5 | 61.6 |
| S | Low | 29" | 42.5 | 56.6° | 11.5 | 62.1° | 58.3 | 35.0 | 2.3 | 45.3 | 5.8 | 13.1 | 122.6 | 73.5 | 39.6 | 61.9 |
| M | Low | 29" | 42.5 | 56.6° | 11.5 | 62.1° | 60.2 | 35.0 | 2.3 | 45.3 | 5.8 | 13.1 | 124.5 | 73.6 | 41.5 | 61.9 |
| L | Low | 29" | 45.6 | 56.6° | 11.5 | 62.1° | 62.3 | 35.0 | 2.3 | 45.3 | 5.8 | 13.1 | 126.6 | 74.3 | 43.6 | 61.9 |
| XL | Low | 29" | 45.6 | 56.6° | 11.5 | 62.1° | 64.8 | 35.0 | 2.3 | 45.3 | 5.8 | 13.1 | 129.1 | 74.5 | 46.1 | 61.9 |