Trek Fuel EX 8 Gen 6 XT

Name: Trek Fuel EX 8 Gen 6 XT
Brand: Trek

2025 MountainTrail Manufacturer page

Trek Fuel EX 8 Gen 6 XT, color Satin Mercury

Last known price: $4,699

Prices shown first for United States
Travel: 140 / 140 mm Fork / rear shock
Wheels: 27.5″, 29″
Drivetrain: 1 × 12 30t / 10–51t
Gear range: 510%
Weight: 15.91 kg 35.1 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 145–156
XS 145–156
SM 154–166
SM 154–166
MD 164–177
MD 164–177
MD/LG 173–180
MD/LG 173–180
LG 177–189
LG 177–189
XL 187–196
XL 187–196
XXL 194–203
XXL 194–203

Components

17 of 18 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, internal storage, angle-adjust headset, Mino Link adjustable geometry, adjustable leverage rate, guided internal routing, magnesium rocker link, 34.9mm seat tube, ISCG 05, 55mm chainline, BSA 73, downtube guard, shuttle guard, ABP, UDH, Boost148, 140mm travel Not identified

Suspension

2 parts

Drivetrain

6 parts

Brakes

2 parts

Wheels and tires

2 parts

Cockpit and contact points

5 parts

Sizes and geometry

14 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD/LG

Table

Reach 476mm

Stack 612mm

Wheelbase 1232mm

Head angle 65.1°

Seat angle 78.0°

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 14 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	404	400	433	430	456	450	476	470	491	485	521	515	551	545
Stackmm	572	574	572	574	612	617	612	617	617	621	630	635	644	648
Top tube lengthmm	516	516	550	551	583	584	606	607	626	627	660	662	695	697
Seat tube lengthmm	360	360	380	380	410	410	420	420	435	435	470	470	500	500
Head tube lengthmm	95	95	95	95	100	100	100	100	105	105	120	120	135	135
Head tube angle	64.9°	64.5°	64.8°	64.5°	65.1°	64.5°	65.1°	64.5°	65.1°	64.5°	65°	64.5°	65°	64.5°
Seat tube angle	78.9°	78.6°	78.5°	78.2°	78.8°	78.2°	78°	77.5°	77.7°	77.2°	77.1°	76.6°	76.5°	76°
Chainstay lengthmm	434	435	434	435	433	435	438	440	438	440	443	445	448	450
Wheelbasemm	1144	1145	1174	1175	1212	1213	1232	1233	1249	1250	1286	1287	1322	1323
Front centermm	711	711	741	741	781	781	796	796	813	813	845	844	876	875
Bottom bracket dropmm	21	25	21	25	31	38	31	38	31	38	30	38	30	38
Bottom bracket heightmm	334	330	334	330	343	336	343	336	343	336	344	336	344	336
Standover heightmm	720	717	727	724	743	737	748	742	754	748	774	767	781	774
Fork rakemm	44	44	44	44	49	48	45	44	45	44	39	40	34	35
Trailmm	119	122	119	122	125	129	125	129	125	129	125	129	125	129
Stack/reach ratio	1.42	1.44	1.32	1.34	1.34	1.37	1.29	1.31	1.26	1.28	1.21	1.23	1.17	1.19

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: 15.91 kg

35.1 lb
Weight limit: 136 kg

299.8 lb

Suspension

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

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 17.1 in
Highest gear: 87.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Derailleur hanger: UDH
Seatpost: Dropper 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: 27.5″, 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: 2025
Sample: 1,808 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

17.1 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,382 bicycles with this information
Coverage: 74.5% of the class

Highest gear

87.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,382 bicycles with this information
Coverage: 74.5% of the class

Shifting

Mechanical

387 of 1,847 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,847 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.5 km/h
Highest gear: 33.3 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: 17.1–87.0 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2025
Lowest gear: 1382 bicycles with this information, 74.5% of the class
Highest gear: 1382 bicycles with this information, 74.5% 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 2025 builds

Differences across 2025 builds
Specification	This bicycle Trek Fuel EX 8 Gen 6 XT	Trek Fuel EX 5 Gen 6	Trek Fuel EX 8 Gen 6 GX AXS T-Type	Trek Fuel EX 9.8 Gen 6 GX AXS T-Type	Trek Fuel EX 9.8 Gen 6 XT	Trek Fuel EX 9.9 Gen 6 X0 AXS T-Type
Frame
Frame material	Aluminum	Aluminum	Aluminum	Carbon	Carbon	Carbon
Bicycle weight	15.91 kg	15.8 kg	15.88 kg	14.53 kg	14.48 kg	14.78 kg
Suspension
Front travel	140 mm	140 mm	140 mm	150 mm	150 mm	140 mm
Drivetrain
Largest sprocket	51	51	52	52	51	52
Lowest gear	17.1 in	17.1 in	16.7 in	16.7 in	17.1 in	16.7 in
Cockpit
Shifting	Mechanical	Mechanical	Electronic	Electronic	Mechanical	Electronic
Other specifications
Tire clearance	Maximum tire width: 2.5″	Maximum tire width: 2.5″	Maximum tire width: 2.5″	Maximum tire width: 2.5″	Maximum tire width: 2.5″	Maximum tire width: 2.6″
Tire width	2.5″	2.4″	2.5″	2.5″	2.5″	2.5″
Wheel material	Aluminum	Aluminum	Aluminum	Carbon	Carbon	Carbon