Trek Session 9.9 29

2021 MountainDownhill Manufacturer page

Last known price: $7,999

Prices shown first for United States
Travel: 190 / 190 mm Fork / rear shock
Wheels: 29″
Drivetrain: 1 × 7 36t / 11–25t
Gear range: 227%
Weight: 15.27 kg 33.7 lb · Reference configuration not specified
Frame: Carbon
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

18 of 19 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

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 Not identified

Suspension

2 parts

Drivetrain

6 parts

Brakes

2 parts

Wheels and tires

2 parts

Cockpit and contact points

6 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 415mm

Stack 619mm

Wheelbase 1245mm

Head angle 62.1°

Seat angle 56.6°

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 Reach Stack

Complete manufacturer geometry table 8 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	400	396	420	415	440	436	465	461
Stackmm	616	619	616	619	616	619	616	619
Top tube lengthmm	568	583	587	602	608	623	633	648
Seat tube lengthmm	425	425	425	425	456	456	456	456
Head tube lengthmm	115	115	115	115	115	115	115	115
Head tube angle	62.6°	62.1°	62.6°	62.1°	62.6°	62.1°	62.6°	62.1°
Seat tube angle	57°	56.6°	57°	56.6°	57°	56.6°	57°	56.6°
Chainstay lengthmm	452	453	452	453	452	453	452	453
Wheelbasemm	1228	1226	1247	1245	1268	1266	1293	1291
Front centermm	776	774	795	793	816	814	841	839
Bottom bracket dropmm	16	23	16	23	16	23	16	23
Bottom bracket heightmm	356	350	356	350	356	350	356	350
Standover heightmm	741	735	742	736	747	743	749	745
Fork rakemm	58	55	57	55	58	55	58	55
Trailmm	128	131	128	131	128	131	128	131
Stack/reach ratio	1.54	1.56	1.47	1.49	1.40	1.42	1.33	1.34

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: Carbon
Bicycle weight: 15.27 kg

33.7 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Full suspension
Front travel: 190 mm
Rear travel: 190 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 7
Smallest sprocket: 11
Largest sprocket: 25
Lowest gear: 41.8 in
Highest gear: 94.9 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

4 measures

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

Front travel

190 mm

This value is below 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

190 mm

This value is within 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

41.8 gear inches

This value is above 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

94.9 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: 16.0 km/h
Highest gear: 36.4 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: 41.8–94.9 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 9.9 29	Trek Session 8 27.5
Frame
Frame material	Carbon	Aluminum
Bicycle weight	15.27 kg	16.27 kg
Suspension
Front travel	190 mm	200 mm
Rear travel	190 mm	210 mm
Drivetrain
Smallest chainring	36	34
Largest chainring	36	34
Lowest gear	41.8 in	37.4 in
Highest gear	94.9 in	85.0 in
Other specifications
Tire clearance	Maximum tire width: 2.5″	Maximum tire width: 2.4″
Tire width	2.5″	2.4″
Wheel size	29″	27.5″
Rear shock spring	Not informed	Coil