Bikes up to 60% offWe monitor over 40,000 bikes daily to find the best prices

Today’s Deals

2026 Trek

Session 8 29 GX

A 29″ aluminum frame full suspension downhill bike with high-end components.

Manufacturer Price

$5,499
Weight42.0 lbs  
FrameAluminum
SuspensionFull, 200 / 200mm
ForkRockShox BoXXer
ShockMarzocchi Bomber
Wheels29″ Aluminum
Drivetrain1 × 7
GroupsetTruvativ Descendant, GX
BrakesSRAM Maven Bronze Hydraulic Disc
View on trekbikes.comLearn about Trek
Similar Bikes
Top Comparison
Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Session 8 29 GX
Other Downhill bikes
Gearing

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.

Lowest gear

(climbing)

27 mph

Session 8 29 GX

26 mph

Similar Bikes

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Sizing
R1

5'3" – 5'10"

R2

5'8" – 6'3"

R3

6'1" – 6'6"

Rider Fit Notes

None yet.

Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.

Price History
Reviews
Pinkbike
Trek Unveils Prototype Session With Adjustable Main Pivot

Feb 2025 · Mike Kazimer

It'll be interesting to see what changes the bike undergoes between the first World Cup DH race in Poland to the last stop at Mont-Sainte Anne - stay tuned for a closer, more in-depth bike check in the future..

Read Review

Geometry
Specs
Build
Frame

Alpha Platinum Aluminum, high main pivot, idler pulley, integrated frame protection, internal or external routing, magnesium rocker link, Mino Link, ISCG 05 2-bolt mount, Active Braking Pivot, 157x12mm thru axle, 200mm travel

BB StandardBSA, 83mm, Threaded

Tire Clearance2.5"

ColorChameleon Green

Fork

RockShox Boxxer, DebonAir+ spring, Rush RC damper, 52mm offset, BoostDH 110x20 Maxle Stealth, 200mm travel

Travel200mm

Spring TypeAir

Shock

undefined - R1: Marzocchi Bomber, 400lb spring, 250mm x 72.5mm; R3: Marzocchi Bomber, 500lb spring, 250mm x 72.5mm; R2: Marzocchi Bomber, 450lb spring, 250mm x 72.5mm

Travel200mm

Bottom Bracket

SRAM DUB, 83mm, BSA threaded

Headset

FSA Orbit, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom (includes geometry adjust angled cups)

Stem

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

Handlebar

Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width

Saddle

Verse Short Comp, steel rails, 145mm width

Seatpost

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

TypeRigid

Pedals

Wellgo BO-87B, alloy body, Cro-Mo axle, replaceable pins

Grips

Trek Line Pro, lock on

Groupset
Rear Derailleur

SRAM GX DH, medium cage

Crank

Truvativ Descendant DH, DUB 83, 34T steel ring, 165mm length

Shifters

SRAM GX DH, 7 speed

Cassette

SRAM PG-720, 11-25, 7 speed

Chain

SRAM PC-1110, 11 speed

Brakes

SRAM Maven Bronze 4-piston hydraulic disc

TypeSRAM Maven Bronze Hydraulic Disc

Wheels
Rims

Front: Bontrager Line DH 30, Tubeless Ready, 6-bolt, 110x20mm Boost thru axle, 29'', Rear: Bontrager Line DH 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano 7 speed freehub, 157x12mm thru axle, 29''

Tires

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

Disc Rotors

Avid Disc Brake Rotor, Centerline, 220mm/6-Bolt - R1, R3, R2: SRAM CenterLine, 6-bolt, round edge, 220mm; R1, R3, R2: SRAM Centerline 2.0, 6-bolt, 200mm

Rider Notes
Riders Also Viewed

First added September 20

Last updated May 30