Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2025 Trek Top Fuel 8 Gen 4
Previous used estimate
$3,081 - $3,170
Actual value depends on condition, size, and local demand.
Value Guide market data · 2025 Trek Top Fuel 8 Gen 4
12-month projected trend
20%
Direction and magnitude, not judgment
vs. category average
4%
Drops faster than category avg
Price over time - 2025 Trek Top Fuel 8 Gen 4
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Top Fuel model years
Overview
About this bike
Top Fuel 8 Gen 4 is a nimble alloy trail bike that strikes a balance between quick climbing efficiency and descending confidence. It packs in a versatile 130mm front and 120mm rear travel for ripping over rocks and roots without sacrificing power on ascents. It's built from lightweight Alpha Platinum Aluminum that helps save your budget for bike trips, but packs in upgrades where they matter, like a 12-speed Shimano XT and SLX drivetrain, and a Fox Rhythm 34 fork. IT'S RIGHT FOR YOU IF... You want an alloy full suspension that's ready to rip. You like to ride everything from cross-country hot laps to all-mountain adventures, and you need a bike that's light, versatile, and confident. You've got an appreciation for the durability of aluminum, but want upgrades where they matter, like your drivetrain and suspension. THE TECH YOU GET An Alpha Platinum Aluminum frame equipped with a 4-way Mino Link lower shock mount for tweaking geometry and suspension leverage rate. A 130mm FOX Rhythm 34 fork with Float EVOL air spring and GRIP damper, plus 120mm of rear travel from a FOX Performance Float shock with a 3-position damper. It's topped off with a Shimano XT/SLX 12-speed groupset, hydraulic disc brakes, a Bontrager Line dropper post, and Tubeless Ready Bontrager Line Comp 30 wheels. THE FINAL WORD Top Fuel 8 Gen 4 is ready to cut loose from all-day climbs to rooty descents. It balances capability and efficiency, with just enough travel to keep the ride smooth without eating up your pedaling power. It gives you the perfect blend of affordability, with a rugged alloy frame, and upgrades where they matter, like the Shimano XT/SLX drivetrain. WHY YOU'LL LOVE IT - Its lightweight frame and versatile geometry make it the perfect choice for all kinds of rides and all kinds of riders - The 4-way Mino Link makes it easy to adjust your geometry or leverage rate for how and where you want to ride - You get a sweet balance of price and performance with upgraded components and a rugged alloy frame - The Alpha Platinum Aluminum frame is robust, yet light, and packs in updated internal frame storage for easy access to gear and snacks - It's more upgrade-ready than ever, with room for bigger 140mm forks and longer-stroke shocks for up to 130mm of rear travel, plus room for extra-long dropper posts
Specifications
- Subtype
- Cross Country
- Category
- Mountain
- Component Fork
- Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 130mm travel
- Component Size
- Small, Medium, Medium/Large, Large, X-Large
- Component Stem
- Bontrager Elite, 35mm, 0 degree, 45mm length
- Product Family
- Top Fuel
- Component Chain
- Shimano SLX M7100, 12 speed
- Component Color
- Lichen Green, Matte Dark Web
- Component Frame
- Alpha Platinum Aluminum, internal storage, tapered head tube, internal guided routing, downtube guard, OCLV Next rocker link, Mino 4 link, ABP, Boost148, 120mm travel
- Component Brakes
- Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper // Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper
- Component Pedals
- Sold Separately
- Component Rotors
- Shimano RT66, 6-bolt, 180mm
- Component Saddle
- Bontrager Verse P3, chromoly rails
- Component Crankset
- Shimano Deore M6120, 30T ring, 55mm chainline, 170mm length
- Component Seatpost
- Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm length
- Component Shifters
- Shimano XT M8100, 12 speed
- Component Handlebar
- Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width
- Component Rear Tire
- Bontrager Gunnison Pro XR, Tubeless Ready, wire bead, 60 tpi, 27.5x2.40''
- Component Wheel Set
- Bontrager Line Comp 30, High Strength 6000 Series Aluminum rim, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 27.5''
- Component Front Tire
- Bontrager Gunnison Pro XR, Tubeless Ready, wire bead, 60 tpi, 27.5x2.40''
- Component Rear Shock
- Fox Performance Float DPS, 2-position damper, 185mm x 50mm
- Component Tape Grips
- Bontrager XR Trail Comp, nylon lock-on
- Component Wheel Size
- 29-inch, 27.5-inch
- Component Bottom Bracket
- Shimano BB-MT501 BSA
- Component Rear Derailleur
- Shimano XT M8100, long cage
- Component Cassette Freewheel
- Shimano SLX M7100, 10-51T, 12 speed
- Rear Shock
- Fox Performance Float DPS, 2-position damper, 185mm x 50mm
- Crankset
- Shimano Deore M6120, 30T ring, 55mm chainline, 170mm length
- Pedals
- Sold Separately
- Bottom Bracket
- Shimano BB-MT501 BSA
- Chain
- Shimano SLX M7100, 12 speed
- Seatpost
- Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm length
- Saddle
- Bontrager Verse P3, chromoly rails
- Handlebar
- Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width
- Rear Derailleur
- Shimano XT M8100, long cage
- Rear Tire
- Bontrager Gunnison Pro XR, Tubeless Ready, wire bead, 60 tpi, 27.5x2.40''
- Stem
- Bontrager Elite, 35mm, 0 degree, 45mm length
- Brakes
- Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper // Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper
- Fork
- Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 130mm travel
- Frame
- Alpha Platinum Aluminum, internal storage, tapered head tube, internal guided routing, downtube guard, OCLV Next rocker link, Mino 4 link, ABP, Boost148, 120mm travel
- Shifters
- Shimano XT M8100, 12 speed
- Tape/Grips
- Bontrager XR Trail Comp, nylon lock-on
- Color
- Matte Dark Web
- Size
- X-Large
- Wheel Size
- 27.5-inch
- Cassette/Freewheel
- Shimano SLX M7100, 10-51T, 12 speed
- Rotors
- Shimano RT66, 6-bolt, 180mm
- Wheel Set
- Bontrager Line Comp 30, High Strength 6000 Series Aluminum rim, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 27.5''
- Front Tire
- Bontrager Gunnison Pro XR, Tubeless Ready, wire bead, 60 tpi, 27.5x2.40''
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.