Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2025 Trek Top Fuel 9.8 XT Gen 4
Previous used estimate
$4,553 - $4,684
Actual value depends on condition, size, and local demand.
Value Guide market data · 2025 Trek Top Fuel 9.8 XT Gen 4
12-month projected trend
22%
Direction and magnitude, not judgment
vs. category average
8%
Drops faster than category avg
Price over time - 2025 Trek Top Fuel 9.8 XT Gen 4
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Top Fuel model years
2026$7,399 - $7,613▲ 63% vs. 20252025$4,553 - $4,684Currently viewing
2024$5,746 - $5,912▲ 26% vs. 2025
2023$3,560 - $3,663▼ 22% vs. 2025
2022$3,739 - $3,847▼ 18% vs. 2025
2021$3,063 - $3,151▼ 33% vs. 2025
2020$3,371 - $3,468▼ 26% vs. 2025
2019$1,149 - $1,182▼ 75% vs. 2025
2018$1,234 - $1,270▼ 73% vs. 2025Overview
About this bike
Top Fuel 9.8 XT Gen 4 is a lightweight carbon trail bike built to rip up climbs and stay playful on descents. It gives you the confidence you want through roots and rocks, thanks to a 120mm/130mm RockShox suspension package with a Pike Select+ fork and Deluxe Ultimate shock. Plus, you get clean shifts from a 12-speed Shimano XT drivetrain. IT'S RIGHT FOR YOU IF... You're after a carbon trail bike that keeps weight to a minimum without compromising on capability. You like to ride everything – long alpine climbs, rooty aspen slalom, fast XC singletrack, and you want a bike that can keep up on the ups and hold its own on the downs. Keeping things light with a carbon frame is important to you, and you want the light yet precise shifting of a Shimano XT drivetrain. THE TECH YOU GET An OCLV Mountain Carbon frame with a 4-way Mino Link lower shock mount for tweaking geometry and suspension leverage rate. A 130mm RockShox Pike Select+ fork with DebonAir spring, and Charger 3.1 RC2 damper, plus 120mm of rear travel from a RockShox Deluxe Ultimate RCT shock. A Shimano XT 12-speed drivetrain, Shimano XT 4-piston hydraulic brakes, Bontrager Line dropper post, and tubeless-ready Bontrager Line Comp 30 wheels. THE FINAL WORD If you're after a light carbon trail bike that balances a playful and capable ride, reach for Top Fuel 9.8 XT Gen 4. Its ultra-lightweight frame pairs with a 4-way Mino Link lower suspension mount for taking control of your geometry and suspension feel. Plus, you get clean shifts from a Shimano XT drivetrain and a sweet RockShox suspension package. WHY YOU'LL LOVE IT - Top Fuel Gen 4 delivers with an intensely lightweight build, improved in-frame storage, and more adjustability for all kinds of rides and riders - With 120mm rear and 130mm front RockShox suspension, it delivers a well-balanced ride that stays efficient on the ups and playful on descents - The 4-way Mino Link makes it easy to adjust your geometry or leverage rate for how and where you want to ride - In-frame storage with an improved BITS bag system makes it easy to stash tools, tubes, 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 Size
- Small, Medium, Medium/Large, Large, X-Large
- Product Family
- Top Fuel
- Component Chain
- Shimano Ultegra/XT M8100, 12 speed
- Component Color
- Axinite Flip, Lunar Silver, Matte Dark Web
- Component Frame
- OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, OCLV Next rocker link, Mino 4 link, ABP, Boost148, 120mm travel
- Component Brakes
- Shimano XT M8120 4-piston hydraulic disc // Shimano XT M8120 4-piston hydraulic disc
- Component Pedals
- Sold Separately
- Component Rotors
- Shimano RT86, 6-bolt, 180mm
- Component Saddle
- Verse Short Comp, steel rails, 145mm width
- Component Crankset
- Shimano XT M8120, 30T, 55mm chainline, 170mm length
- Component Seatpost
- Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length
- Component Shifters
- Shimano XT M8100, 12 speed
- Component Rear Tire
- Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40'' // Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40''
- 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, 29''
- Component Front Tire
- Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40'' // Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40''
- Component Rear Shock
- RockShox Deluxe Ultimate RCT, 185mm x 50mm
- Component Tape Grips
- Bontrager XR Trail Elite, 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 XT M8100, 10-51, 12 speed
- Rear Shock
- RockShox Deluxe Ultimate RCT, 185mm x 50mm
- Crankset
- Shimano XT M8120, 30T, 55mm chainline, 170mm length
- Pedals
- Sold Separately
- Bottom Bracket
- Shimano BB-MT501 BSA
- Chain
- Shimano Ultegra/XT M8100, 12 speed
- Seatpost
- Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length
- Saddle
- Verse Short Comp, steel rails, 145mm width
- Rear Derailleur
- Shimano XT M8100, long cage
- Rear Tire
- Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40'' // Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40''
- Brakes
- Shimano XT M8120 4-piston hydraulic disc // Shimano XT M8120 4-piston hydraulic disc
- Frame
- OCLV Mountain Carbon, 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 Elite, nylon lock-on
- Color
- Matte Dark Web
- Size
- X-Large
- Wheel Size
- 27.5-inch
- Cassette/Freewheel
- Shimano XT M8100, 10-51, 12 speed
- Rotors
- Shimano RT86, 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, 29''
- Front Tire
- Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40'' // Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40''
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.