Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Fuel EX 8 Gen 5
Previous used estimate
$1,663 - $1,711
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Trek Fuel EX 8 Gen 5
12-month projected trend
11%
Direction and magnitude, not judgment
vs. category average
2%
Drops faster than category avg
Price over time - 2021 Trek Fuel EX 8 Gen 5
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 An alloy frame, 140mm FOX Rhythm 34 fork, and 130mm of rear travel with an extra-efficient RE:aktiv damper. A Shimano XT 1x12 drivetrain with an extra-low 51-tooth climbing gear, plus a Bontrager Line dropper post. The final word Fuel EX 8 gives you added efficiency with Shimano'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" wheels, S - frames get to choose between 27.5" or 29", and sizes M to XL get 29" wheels
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, 40/50mm length
- Product Family
- Fuel
- Component Axles
- Front: Boost 110 x 15mm thru-axle Rear: Boost 148 x 12mm thru-axle
- Component Chain
- Shimano SLX M7100, 12 speed
- Component Color
- Rage Red to Dnister Black Fade
- 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
- Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, Bontrager TLR valve, 50mm
- Component Brakes
- Front: Shimano 4-piston hydraulic disc, MT420 caliper Rear: Shimano hydraulic disc, MT420 4-piston caliper
- 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
- Shimano SLX M7100, Boost (52mm chainline), 170/75mm length
- Component Shifters
- Shimano XT M8100, 12 speed
- Component Seat Post
- Bontrager Line Dropper, 100/150mm travel, internal routing, 31.6mm, 345/440mm length
- Component Chainrings
- 30T
- Component Handlebars
- Bontrager Line, alloy, 35mm, 27.5mm rise, 750/780mm 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 Brake Levers
- MT4100
- Component Bottom Bracket
- Shimano MT500, 92mm, PressFit
- Component Rear Derailleur
- Shimano XT M8100, long cage, 51T max cog
- Component Cassette Rear Cogs
- Shimano XT M8100, 10-51, 12 speed
- Rear Shock
- Fox Performance Float EVOL, RE:aktiv 3-position damper, tuned by Trek Suspension Lab
- Tires
- Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, Bontrager TLR valve, 50mm
- Crankset
- Shimano SLX M7100, Boost (52mm chainline), 170/75mm length
- Bottom Bracket
- Shimano MT500, 92mm, PressFit
- Chain
- Shimano SLX M7100, 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
- Shimano XT M8100, long cage, 51T max cog
- Stem
- Bontrager Line, 35mm, Knock Block, 0 degree, 40/50mm length
- Axles
- Front: Boost 110 x 15mm thru-axle Rear: Boost 148 x 12mm thru-axle
- Brake Levers
- MT4100
- Brakes
- Front: Shimano 4-piston hydraulic disc, MT420 caliper Rear: Shimano hydraulic disc, MT420 4-piston caliper
- Chainrings
- 30T
- 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, 750/780mm width
- Seat Post
- Bontrager Line Dropper, 100/150mm travel, internal routing, 31.6mm, 345/440mm length
- Shifters
- Shimano XT M8100, 12 speed
- Color
- Rage Red to Dnister Black Fade
- Size
- XX-Large
- Wheel Size
- 29-inch
- Cassette/Rear Cogs
- Shimano XT M8100, 10-51, 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.