Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Fuel EX 8 GX
Previous used estimate
$1,670 - $1,718
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Trek Fuel EX 8 GX
12-month projected trend
10%
Direction and magnitude, not judgment
vs. category average
3%
Holds value better than category avg
Price over time - 2021 Trek Fuel EX 8 GX
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Fuel model years
Overview
About this bike
Fuel EX 8 is the ideal trail bike for riders who want a versatile full suspension ripper that makes soul-crushing climbs less painful, but can also huck rowdy trails. It hits the sweet spot of value and performance in our mountain bike lineup by combining high-end parts with a stout but light alloy frame. It's right for you if... You're cool with your wheels leaving the ground, but you also like to go the distance on marathon singletrack sessions. You want a bike that lets you crush any trail, and your priority is on the parts. The tech you get A lightweight aluminum frame, 140mm FOX Rhythm 34 fork, and 130mm of rear travel with an extra-efficient RE:aktiv damper. A SRAM GX Eagle 1x12 drivetrain with an extra-low 52-tooth climbing gear, plus a Bontrager Line dropper post. The final word Fuel EX 8 gives you added efficiency with SRAM's latest, widest-range drivetrain and Trek's unique RE:aktiv damper that provides firm pedaling support without giving up any plush compliance. Why you'll love it - A wider gear range and more efficient suspension help you claw your way up tricky climbs you never thought you'd clean - If you measure quality in performance per dollar, you won't do better than Fuel EX 8 - This bike will make you want to rail every corner, smash every rock garden, and charge every descent - The shifter-style, underbar remote dropper post lever is super intuitive and easy to use - We expanded our size range to ensure a better fit for all riders. And, you get the fastest wheel that fits your frame: XS frames get 27.5-inch wheels, S frames get to choose between 27.5-inch or 29-inch, and sizes M to XL get 29-inch wheels Wheel size: Sizes X-Small – Small: 27.5-inch Sizes Small – XX-Large: 29-inch
Specifications
- Subtype
- Trail / Enduro
- Category
- Mountain
- Component Fork
- Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 140mm travel
- Component Size
- X-Small, Small, Medium, Medium/Large, Large, X-Large, XX-Large
- Component Stem
- Bontrager Line, 35mm, Knock Block, 0 degree
- Product Family
- Fuel
- Component Axles
- Front: 110 x 15mm Rear: 148 x 12mm
- Component Chain
- SRAM GX Eagle, 12 speed
- Component Color
- Rage Red to Dnister Black Fade, Dark Aquatic/Trek Black
- Component Frame
- Alpha Platinum Aluminum, tapered head tube, Knock Block, Control Freak internal routing, downtube guard, ISCG 05, magnesium rocker link, Mino Link, ABP, Boost148, 130mm travel
- Component Tires
- Size XS - SM: Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.40'' Size SM - XXL: Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 29x2.40''
- Component Brakes
- SRAM G2 R 4-piston hydraulic disc
- Component Pedals
- Sold separately
- Component Saddle
- Bontrager Arvada, hollow chromoly rails, 138mm width
- Component Headset
- Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom
- Component Crankset
- SRAM X1 Eagle, DUB
- Component Shifters
- SRAM GX Eagle, 12 speed
- Component Seat Post
- Bontrager Line Dropper, internal routing, 31.6mm
- Component Chainrings
- 30T steel ring
- Component Handlebars
- Bontrager Line, alloy, 35mm, 27.5mm rise, 750mm width
- Component Rear Shock
- Fox Performance Float EVOL, RE:aktiv 3-position damper, tuned by Trek Suspension Lab
- Component Wheel Size
- 27.5-inch, 29-inch
- Component Bottom Bracket
- SRAM DUB, 92mm, PressFit
- Component Rear Derailleur
- SRAM GX Eagle
- Component Cassette Rear Cogs
- SRAM Eagle XG-1275, 10-52, 12 speed
- Rear Shock
- Fox Performance Float EVOL, RE:aktiv 3-position damper, tuned by Trek Suspension Lab
- Tires
- Size XS - SM: Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.40'' Size SM - XXL: Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 29x2.40''
- Crankset
- SRAM X1 Eagle, DUB
- Pedals
- Sold separately
- Bottom Bracket
- SRAM DUB, 92mm, PressFit
- Chain
- SRAM GX Eagle, 12 speed
- Saddle
- Bontrager Arvada, hollow chromoly rails, 138mm width
- Headset
- Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom
- Rear Derailleur
- SRAM GX Eagle
- Stem
- Bontrager Line, 35mm, Knock Block, 0 degree
- Axles
- Front: 110 x 15mm Rear: 148 x 12mm
- Brakes
- SRAM G2 R 4-piston hydraulic disc
- Chainrings
- 30T steel ring
- Fork
- Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 140mm travel
- Frame
- Alpha Platinum Aluminum, tapered head tube, Knock Block, Control Freak internal routing, downtube guard, ISCG 05, magnesium rocker link, Mino Link, ABP, Boost148, 130mm travel
- Handlebars
- Bontrager Line, alloy, 35mm, 27.5mm rise, 750mm width
- Seat Post
- Bontrager Line Dropper, internal routing, 31.6mm
- Shifters
- SRAM GX Eagle, 12 speed
- Color
- Dark Aquatic/Trek Black
- Size
- XX-Large
- Wheel Size
- 29-inch
- Cassette/Rear Cogs
- SRAM Eagle XG-1275, 10-52, 12 speed
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Suspension service
Confirm fork and rear shock service intervals and check pivot bearings for play.