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 GX AXS Gen 4
Previous used estimate
$5,107 - $5,254
Actual value depends on condition, size, and local demand.
Value Guide market data · 2025 Trek Top Fuel 9.8 GX AXS 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 GX AXS 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▲ 45% vs. 20252025$5,107 - $5,254Currently viewing
2024$5,746 - $5,912▲ 13% vs. 2025
2023$3,560 - $3,663▼ 30% vs. 2025
2022$3,739 - $3,847▼ 27% vs. 2025
2021$3,063 - $3,151▼ 40% vs. 2025
2020$3,371 - $3,468▼ 34% vs. 2025
2019$1,149 - $1,182▼ 78% vs. 2025
2018$1,234 - $1,270▼ 76% vs. 2025Overview
About this bike
Top Fuel 9.8 GX AXS 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 can shift easy even under load with a SRAM GX Eagle AXS wireless transmission. 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 smooth-shifting performance of a direct mount transmission. 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 SRAM GX Eagle wireless transmission, SRAM Level Bronze 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 GX AXS 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 a wireless SRAM GX AXS transmission and 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 Fork
- RockShox Pike Select+, DebonAir spring, Charger 3.1 RC2 damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 130mm travel
- Component Size
- Small, Medium, Medium/Large, Large, X-Large
- Product Family
- Top Fuel
- Component Chain
- SRAM GX Eagle, T-Type, 12 speed
- Component Color
- 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
- SRAM Level Bronze 4-piston hydraulic disc // SRAM Level Bronze 4-piston hydraulic disc
- Component Pedals
- Sold Separately
- Component Rotors
- SRAM CenterLine, 6-bolt, round edge, 180mm
- Component Saddle
- Verse Short Comp, steel rails, 145mm width
- Component Crankset
- SRAM GX Eagle, T-Type, DUB, 30T, 55mm chainline, 170mm length
- Component Seatpost
- Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length
- Component Shifters
- SRAM AXS POD
- Component Handlebar
- Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm handlebar rise, 820mm width, 0 degree stem rise, 45mm stem length
- 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, SRAM XD 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
- SRAM DUB MTB Wide, 73mm, BSA threaded
- Component Rear Derailleur
- SRAM GX Eagle AXS, T-Type
- Component Cassette Freewheel
- SRAM Eagle XS-1275, T-Type, 10-52, 12 speed
- Rear Shock
- RockShox Deluxe Ultimate RCT, 185mm x 50mm
- Crankset
- SRAM GX Eagle, T-Type, DUB, 30T, 55mm chainline, 170mm length
- Pedals
- Sold Separately
- Bottom Bracket
- SRAM DUB MTB Wide, 73mm, BSA threaded
- Chain
- SRAM GX Eagle, T-Type, 12 speed
- Seatpost
- Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length
- Saddle
- Verse Short Comp, steel rails, 145mm width
- Handlebar
- Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm handlebar rise, 820mm width, 0 degree stem rise, 45mm stem length
- Rear Derailleur
- SRAM GX Eagle AXS, T-Type
- 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
- SRAM Level Bronze 4-piston hydraulic disc // SRAM Level Bronze 4-piston hydraulic disc
- Fork
- RockShox Pike Select+, DebonAir spring, Charger 3.1 RC2 damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 130mm travel
- 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
- SRAM AXS POD
- Tape/Grips
- Bontrager XR Trail Elite, nylon lock-on
- Color
- Matte Dark Web
- Size
- X-Large
- Wheel Size
- 27.5-inch
- Cassette/Freewheel
- SRAM Eagle XS-1275, T-Type, 10-52, 12 speed
- Rotors
- SRAM CenterLine, 6-bolt, round edge, 180mm
- Wheel Set
- Bontrager Line Comp 30, High Strength 6000 Series Aluminum rim, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD 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.