Trek Rail 9.9 CXR Gen 4

Name: Trek Rail 9.9 CXR Gen 4
Brand: Trek

2024 MountainEnduro Electric bicycle Manufacturer page

Last known price: $13,299

Prices shown first for United States
Travel: 160 / 150 mm Fork / rear shock
Wheels: 29″
Drivetrain: 1 × 12 34t / 10–51t
Gear range: 510%
Battery: 625 Wh
Weight: 22.63 kg 49.9 lb · Reference configuration not specified
Frame: Carbon
Brakes: Hydraulic disc

Sizes

Size guide

15.5" High
15.5" Low
17.5" High
17.5" Low
19.5" High
19.5" Low
21.5" High
21.5" Low

The manufacturer did not publish rider heights for these sizes.

Components

22 of 24 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, 1.8'' lower head tube, Bosch System Controller compatible, Removable Integrated Battery (RIB), Knock Block 2.0, guided internal routing, 34.9mm seat tube, magnesium rocker link, Motor Armor, Mino Link, ABP, Boost148, 12mm thru axle, 150mm travel Not identified

Electric system

3 parts

Suspension

3 parts

Drivetrain

6 parts

Bottom bracket
- Bosch
Cassette
- Shimano XTR CS-M9101-12 12 speeds
CS-M9101-12
Chain
- Shimano XTR CN-M9100
CN-M9100
Crankset
- e*thirteen 34t
Rear derailleur
- Shimano XTR RD-M9100 12 speeds
RD-M9100
Shifters
- Shimano XTR SL-M9100
SL-M9100

Brakes

2 parts

Wheels and tires

2 parts

Cockpit and contact points

7 parts

Grips
- Bontrager
Handlebar
- Bontrager
Headset

Knock Block Integrated, 67-deree radius, cartridge bearing, 1-1/8'' top, 1.8'' bottom Not identified
Pedals
- VP
VP-536
Saddle
- Bontrager
Seatpost
- Bontrager
Stem
- Bontrager

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 17.5" Low

Table

Reach 452mm

Stack 633mm

Wheelbase 1236mm

Head angle 64.2°

Seat angle 76.7°

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	436	432	456	452	491	487	521	517
Stackmm	625	628	629	633	643	646	656	660
Top tube lengthmm	579	580	600	601	638	639	671	673
Seat tube lengthmm	410	410	420	420	450	450	500	500
Head tube lengthmm	105	105	110	110	125	125	140	140
Head tube angle	64.6°	64.2°	64.6°	64.2°	64.6°	64.2°	64.6°	64.2°
Seat tube angle	77.1°	76.7°	77.1°	76.7°	77.1°	76.7°	77.1°	76.7°
Chainstay lengthmm	447	448	447	448	447	448	447	448
Wheelbasemm	1213	1214	1236	1236	1277	1278	1313	1314
Front centermm	767	768	790	790	831	832	867	868
Bottom bracket dropmm	27	33	27	33	27	33	27	33
Bottom bracket heightmm	346	341	346	341	346	341	346	341
Standover heightmm	761	756	773	768	770	765	768	763
Fork rakemm	42	43	43	42	43	43	43	42
Trailmm	130	133	130	133	130	133	130	133
Stack/reach ratio	1.43	1.45	1.38	1.40	1.31	1.33	1.26	1.28

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: 22.63 kg

49.9 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Full suspension
Front travel: 160 mm
Rear travel: 150 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 34
Largest chainring: 34
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 19.3 in
Highest gear: 98.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Electric system

Battery capacity: 625 Wh

Additional specifications

Battery: Size: S, Bosch PowerTube 625Wh, smart system; Size: M, L, XL, Bosch PowerTube 750Wh, smart system
Bottom bracket standard: Bosch
Fork spring: Air
Tire clearance: Maximum tire width: 2.6″
Tire width: 2.5″
Wheel material: Carbon
Wheel size: 29″

Technical analysis

3 measures

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

Front travel

160 mm

This value is within the central range for this class.

Cohort: Mountain / Enduro Model year: 2024
Sample: 1,578 bicycles with this information
Coverage: 98.0% of the class

Rear travel

150 mm

This value is within the central range for this class.

Cohort: Mountain / Enduro Model year: 2024
Sample: 1,329 bicycles with this information
Coverage: 82.5% of the class

Shifting

Mechanical

439 of 1,609 bicycles with this information use electronic shifting.

Cohort: Mountain / Enduro Model year: 2024
Sample: 1,609 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.4 km/h
Highest gear: 37.8 km/h

Total gear range 510%

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: 19.3–98.6 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 2024 builds
Specification	This bicycle Trek Rail 9.9 CXR Gen 4	Trek Rail 5 625W Gen 3	Trek Rail 5 Gen 3	Trek Rail 7 Gen 3	Trek Rail 8 Gen 3 GX AXS T-Type	Trek Rail 9.5 Gen 4
Frame
Frame material	Carbon	Aluminum	Aluminum	Aluminum	Aluminum	Carbon
Bicycle weight	22.63 kg	24.88 kg	Not informed	24.13 kg	23.88 kg	24.23 kg
Drivetrain
Smallest chainring	34	34	34	Not informed	Not informed	34
Largest chainring	34	34	34	Not informed	Not informed	34
Smallest sprocket	10	11	10	10	10	11
Largest sprocket	51	51	51	51	52	51
Lowest gear	19.3 in	19.3 in	19.3 in	Not informed	Not informed	19.3 in
Highest gear	98.6 in	89.6 in	98.6 in	Not informed	Not informed	89.6 in
Cockpit
Shifting	Mechanical	Mechanical	Mechanical	Mechanical	Electronic	Mechanical
Derailleur hanger	Not informed	Not informed	Not informed	Not informed	UDH	Not informed
Electric bicycle systems
Battery capacity	625 Wh	625 Wh	500 Wh	625 Wh	625 Wh	625 Wh
Other specifications
Bottom bracket standard	Bosch	Not informed	Not informed	Not informed	Not informed	Bosch
Tire width	2.5″	2.4″	2.4″	2.5″	2.5″	2.6″
Wheel material	Carbon	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum