Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2025 Trek Top Fuel 9.9 X0 AXS Gen 4
Previous used estimate
$6,230 - $6,410
Actual value depends on condition, size, and local demand.
Value Guide market data · 2025 Trek Top Fuel 9.9 X0 AXS Gen 4
12-month projected trend
28%
Direction and magnitude, not judgment
vs. category average
7%
Drops faster than category avg
Price over time - 2025 Trek Top Fuel 9.9 X0 AXS Gen 4
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Top model years
2025$6,230 - $6,410Currently viewing
2024$2,116 - $2,177▼ 66% vs. 2025
2023$3,655 - $3,760▼ 41% vs. 2025
2021$3,148 - $3,239▼ 49% vs. 2025
2020$3,381 - $3,479▼ 46% vs. 2025
2019$2,256 - $2,321▼ 64% vs. 2025
2018$2,235 - $2,299▼ 64% vs. 20252017$2,046 - $2,105▼ 67% vs. 2025
2016$1,992 - $2,050▼ 68% vs. 2025
2012$1,561 - $1,606▼ 75% vs. 2025
2011$1,437 - $1,478▼ 77% vs. 2025
2010$1,313 - $1,351▼ 79% vs. 2025
2009$1,153 - $1,186▼ 81% vs. 2025
2008$1,153 - $1,186▼ 81% vs. 2025
2007$1,249 - $1,285▼ 80% vs. 2025Overview
About this bike
Top Fuel 9.9 X0 AXS Gen 4 is an ultra-light and capable carbon trail bike that's built for soaring up climbs and rallying over miles of singletrack. This top-level build delivers the performance you want, with a RockShox Ultimate suspension package (120mm/130mm), and SRAM's wireless X0 AXS transmission that shifts smooth and easy, especially under load. It's topped off with carbon wheels to keep your ride light from top to bottom. IT'S RIGHT FOR YOU IF... You want the best carbon trail bike with all-mountain capability, climbing efficiency, and components to match. You don't mind spending a little extra to get the ultra-clean shifting of SRAM's X0 AXS wireless transmission, and an upgraded RockShox Ultimate suspension package is a must. 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 Ultimate fork with DebonAir spring and Charger 3.1 RC2 damper, plus 120mm of rear travel from a RockShox Deluxe Ultimate RCT shock. A wireless SRAM X0 AXS transmission, SRAM Level Silver Stealth 4-piston hydraulic brakes, Bontrager Line dropper post, and tubeless-ready Bontrager Line Pro 30 carbon wheels. THE FINAL WORD When you're after the best all-mountain carbon ride, reach for Top Fuel X0 AXS 9.9 Gen 4. With an ultra-light frame, carbon wheels, and SRAM X0 wireless transmission, it delivers everything you want on dirt. Plus, it's built with a 4-way Mink Link lower suspension mount for taking control of your geometry and suspension feel. 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 Ultimate 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
- Category
- Mountain
- Component Fork
- RockShox Pike Ultimate, DebonAir spring, Charger 3.1 RC2 damper, 44mm offset, Boost110, Maxle Stealth, 130mm travel
- Component Size
- Small, Medium, Medium/Large, Large, X-Large
- Product Family
- Top
- Component Chain
- SRAM X0 Eagle, T-Type, 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
- SRAM Level Silver 4-piston hydraulic disc // SRAM Level Silver Stealth 4-piston hydraulic disc
- Component Pedals
- Sold Separately
- Component Rotors
- SRAM HS2, 6-bolt, 180mm
- Component Saddle
- Verse Short Pro, carbon rails, 145mm width
- Component Crankset
- SRAM X0 Eagle, DUB, 30T steel, T-Type, 55mm chainline, 170mm length
- Component Seatpost
- RockShox Reverb AXS, 170mm travel, wireless, 34.9mm, 480mm length
- Component Shifters
- SRAM AXS POD // SRAM AXS POD, paired with dropper
- 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 Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, 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 Wheel Size
- 29-inch, 27.5-inch
- Component Bottom Bracket
- SRAM DUB MTB Wide, 73mm, BSA threaded
- Component Rear Derailleur
- SRAM X0 Eagle AXS, T-Type
- Component Cassette Freewheel
- SRAM Eagle XS-1295, T-Type, 10-52, 12 speed
- Rear Shock
- RockShox Deluxe Ultimate RCT, 185mm x 50mm
- Crankset
- SRAM X0 Eagle, DUB, 30T steel, T-Type, 55mm chainline, 170mm length
- Pedals
- Sold Separately
- Bottom Bracket
- SRAM DUB MTB Wide, 73mm, BSA threaded
- Chain
- SRAM X0 Eagle, T-Type, 12 speed
- Seatpost
- RockShox Reverb AXS, 170mm travel, wireless, 34.9mm, 480mm length
- Saddle
- Verse Short Pro, carbon 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 X0 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 Silver 4-piston hydraulic disc // SRAM Level Silver Stealth 4-piston hydraulic disc
- Fork
- RockShox Pike Ultimate, DebonAir spring, Charger 3.1 RC2 damper, 44mm offset, Boost110, 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 // SRAM AXS POD, paired with dropper
- Color
- Matte Dark Web
- Size
- X-Large
- Wheel Size
- 27.5-inch
- Cassette/Freewheel
- SRAM Eagle XS-1295, T-Type, 10-52, 12 speed
- Rotors
- SRAM HS2, 6-bolt, 180mm
- Wheel Set
- Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, 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.