Trek Fuel EX 8 GX

Name: Trek Fuel EX 8 GX
Brand: Trek

2021 MountainTrail Manufacturer page

Trek Fuel EX 8 GX, color Dark Aquatic / Trek Black

Travel: 140 / 130 mm Fork / rear shock
Wheels: 29″
Drivetrain: 1 × 12 30t / 10–52t
Gear range: 520%
Weight: 13.78 kg 30.4 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

18.5" High
18.5" Low

The manufacturer did not publish rider heights for these sizes.

Components

20 of 22 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 Aluminium, tapered head tube, Knock Block, Control Freak internal routing, downtube guard, ISCG 05, magnesium rocker link, Mino Link, ABP, Boost148, 130 mm travel Not identified

Suspension

2 parts

Drivetrain

6 parts

Brakes

2 parts

Brakes
- SRAM G2
Disc rotors
- SRAM

Wheels and tires

5 parts

Cockpit and contact points

6 parts

Grips
- Bontrager
Handlebar
- Bontrager
Headset

Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom Not identified
Saddle
- Bontrager
Seatpost
- Bontrager
Stem
- Bontrager

Sizes and geometry

2 sizes Open in the geometry plotter

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

Size 18.5" High

Table

Reach 460mm

Stack 609mm

Wheelbase 1195mm

Head angle 66.5°

Seat angle 75.5°

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 2 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	460	455
Stackmm	609	613
Top tube lengthmm	618	619
Seat tube lengthmm	435	435
Head tube lengthmm	105	105
Head tube angle	66.5°	66°
Seat tube angle	75.5°	75°
Chainstay lengthmm	436	437
Wheelbasemm	1195	1196
Front centermm	760	761
Bottom bracket dropmm	28	34
Bottom bracket heightmm	346	340
Standover heightmm	751	745
Fork rakemm	43	43
Trailmm	116	119
Stack/reach ratio	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: 13.78 kg

30.4 lb
Weight limit: 136 kg

299.8 lb

Suspension

Suspension configuration: Full suspension
Front travel: 140 mm
Rear travel: 130 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 52
Lowest gear: 16.7 in
Highest gear: 87.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BB86/BB92
Fork spring: Air
Tire clearance: Maximum tire width: 2.6″
Tire width: 2.6″
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

140 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,324 bicycles with this information
Coverage: 98.1% of the class

Lowest gear

16.7 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,137 bicycles with this information
Coverage: 84.2% of the class

Highest gear

87.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,137 bicycles with this information
Coverage: 84.2% of the class

Shifting

Mechanical

53 of 1,346 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,346 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.4 km/h
Highest gear: 33.3 km/h

Total gear range 520%

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: 16.7–87.0 gear inches
Class reference (p10–p90): 16.9–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2021
Lowest gear: 1137 bicycles with this information, 84.2% of the class
Highest gear: 1137 bicycles with this information, 84.2% 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

Differences across 2021 builds
Specification	This bicycle Trek Fuel EX 8 GX	Trek Fuel EX 5	Trek Fuel EX 5 Deore	Trek Fuel EX 7	Trek Fuel EX 7 NX	Trek Fuel EX 8
Frame
Bicycle weight	13.78 kg	15.7 kg	15.7 kg	14.11 kg	14.48 kg	13.86 kg
Drivetrain
Front chainrings	1	1	1	1	1	Not informed
Smallest chainring	30	30	30	30	30	Not informed
Largest chainring	30	30	30	30	30	Not informed
Smallest sprocket	10	10	10	11	11	10
Largest sprocket	52	51	51	50	50	51
Lowest gear	16.7 in	17.1 in	17.1 in	17.4 in	17.4 in	Not informed
Highest gear	87.0 in	87.0 in	87.0 in	79.1 in	79.1 in	Not informed
Other specifications
Tire width	2.6″	2.6″	2.6″	2.6″	2.6″	2.5″
Wheel size	29″	27.5″ / 29″	27.5″ / 29″	27.5″ / 29″	27.5″ / 29″	27.5″ / 29″