Trek Session 8 29 GX

Name: Trek Session 8 29 GX
Brand: Trek

2025 MountainDownhill Manufacturer page

Trek Session 8 29 GX, color Satin Trek Black

Last known price: $6,049

Prices shown first for United States
Travel: 200 / 200 mm Fork / rear shock
Wheels: 29″
Drivetrain: 1 × 7 34t / 11–25t
Gear range: 227%
Weight: 17.92 kg 39.5 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

R1 161–176
R1 161–176
R2 173–188
R2 173–188
R3 186–196
R3 186–196

Components

19 of 20 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

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 Not identified

Suspension

2 parts

Drivetrain

6 parts

Brakes

2 parts

Wheels and tires

2 parts

Cockpit and contact points

7 parts

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size R2

Table

Reach 472mm

Stack 634mm

Wheelbase 1274mm

Head angle 63.6°

Seat angle 77.1°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	447	440	472	465	499	493
Stackmm	634	639	634	639	634	639
Top tube lengthmm	586	587	617	618	652	653
Seat tube lengthmm	425	425	425	425	425	425
Head tube lengthmm	117	117	117	117	117	117
Head tube angle	63.6°	63°	63.6°	63°	63.6°	63°
Seat tube angle	77.1°	76.5°	77.1°	76.5°	77.1°	76.5°
Chainstay lengthmm	435	439	441	445	448	452
Wheelbasemm	1243	1246	1274	1277	1309	1312
Front centermm	808	808	833	833	861	861
Bottom bracket dropmm	12	21	12	21	12	21
Bottom bracket heightmm	362	353	362	353	362	353
Standover heightmm	755	747	759	751	757	749
Fork rakemm	47	47	47	47	48	47
Trailmm	131	136	131	136	132	136
Stack/reach ratio	1.42	1.45	1.34	1.37	1.27	1.30

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Bicycle weight: 17.92 kg

39.5 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Full suspension
Front travel: 200 mm
Rear travel: 200 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 34
Largest chainring: 34
Rear sprockets: 7
Smallest sprocket: 11
Largest sprocket: 25
Lowest gear: 39.4 in
Highest gear: 89.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire clearance: Maximum tire width: 2.5″
Tire width: 2.5″
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

2 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

200 mm

This value is within the central range for this class.

Cohort: Mountain / Downhill Model year: 2025
Sample: 99 bicycles with this information
Coverage: 98.0% of the class

Rear travel

200 mm

This value is within the central range for this class.

Cohort: Mountain / Downhill Model year: 2025
Sample: 95 bicycles with this information
Coverage: 94.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 15.1 km/h
Highest gear: 34.3 km/h

Total gear range 227%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 39.4–89.6 gear inches

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2025 builds
Specification	This bicycle Trek Session 8 29 GX	Trek Session 8	Trek Session 9 X01
Frame
Bicycle weight	17.92 kg	17.92 kg	18.1 kg
Other specifications
Tire clearance	Maximum tire width: 2.5″	Maximum tire width: 2.5″	Maximum tire width: 2.6″