Trek Session 8 27.5

2021 MountainDownhill Manufacturer page

Last known price: $4,799

Prices shown first for United States
Travel: 200 / 210 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 1 × 7 34t / 11–25t
Gear range: 227%
Weight: 16.27 kg 35.9 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

SM High
SM Low
MD High
MD Low
LG High
LG Low
XL High
XL Low

The manufacturer did not publish rider heights for these sizes.

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, tapered head tube, internal control routing, integrated frame protection, downtube guard, ISCG 05 mount, magnesium rocker link, Mino Link, ABP, 157x12mm thru axle, 210mm 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

8 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size MD Low

Table

Reach 402mm

Stack 607mm

Wheelbase 1203mm

Head angle 63.6°

Seat angle 57.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 8 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	389	382	408	402	432	426	456	450
Stackmm	603	607	603	607	603	607	603	607
Top tube lengthmm	570	574	590	594	614	618	638	642
Seat tube lengthmm	426	426	426	426	456	456	456	456
Head tube lengthmm	115	115	115	115	115	115	115	115
Head tube angle	64.2°	63.6°	64.2°	63.6°	64.2°	63.6°	64.2°	63.6°
Seat tube angle	57.6°	57°	57.6°	57°	57.6°	57°	57.6°	57°
Chainstay lengthmm	443	445	443	445	443	445	443	445
Wheelbasemm	1185	1183	1205	1203	1229	1227	1253	1251
Front centermm	742	738	762	758	786	782	810	806
Bottom bracket dropmm	9	-1	9	-1	9	-1	9	-1
Bottom bracket heightmm	364	356	364	356	364	356	364	356
Standover heightmm	810	804	793	790	790	784	775	767
Fork rakemm	59	49	60	49	60	49	60	49
Trailmm	114	118	114	118	114	118	114	118
Stack/reach ratio	1.55	1.59	1.48	1.51	1.40	1.43	1.32	1.35

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: 16.27 kg

35.9 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Full suspension
Front travel: 200 mm
Rear travel: 210 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: 37.4 in
Highest gear: 85.0 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
Rear shock spring: Coil
Tire clearance: Maximum tire width: 2.4″
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

4 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: 2021
Sample: 106 bicycles with this information
Coverage: 98.1% of the class

Rear travel

210 mm

This value is above the central range for this class.

Cohort: Mountain / Downhill Model year: 2021
Sample: 99 bicycles with this information
Coverage: 91.6% of the class

Lowest gear

37.4 gear inches

This value is within the central range for this class.

Cohort: Mountain / Downhill Model year: 2021
Sample: 97 bicycles with this information
Coverage: 89.8% of the class

Highest gear

85.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Downhill Model year: 2021
Sample: 97 bicycles with this information
Coverage: 89.8% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 14.3 km/h
Highest gear: 32.6 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: 37.4–85.0 gear inches
Class reference (p10–p90): 30.9–103.9 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Downhill Model year: 2021
Lowest gear: 97 bicycles with this information, 89.8% of the class
Highest gear: 97 bicycles with this information, 89.8% of the class

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 2021 builds
Specification	This bicycle Trek Session 8 27.5	Trek Session 9.9 29
Frame
Frame material	Aluminum	Carbon
Bicycle weight	16.27 kg	15.27 kg
Suspension
Front travel	200 mm	190 mm
Rear travel	210 mm	190 mm
Drivetrain
Smallest chainring	34	36
Largest chainring	34	36
Lowest gear	37.4 in	41.8 in
Highest gear	85.0 in	94.9 in
Other specifications
Rear shock spring	Coil	Not informed
Tire clearance	Maximum tire width: 2.4″	Maximum tire width: 2.5″
Tire width	2.4″	2.5″
Wheel size	27.5″	29″