Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2025 Trek Top Fuel 9 Gen 4
Previous used estimate
$3,644 - $3,749
Actual value depends on condition, size, and local demand.
Value Guide market data · 2025 Trek Top Fuel 9 Gen 4
12-month projected trend
21%
Direction and magnitude, not judgment
vs. category average
5%
Drops faster than category avg
Price over time - 2025 Trek Top Fuel 9 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 9 Gen 4 is an alloy trail bike that's ready to billy-goat up long climbs and rip back to the bottom for another lap. It gives you the rugged benefits of a lightweight aluminum frame, plus the upgrades you crave, like fully wireless shifting from SRAM's GX Eagle AXS transmission, 4-piston hydraulic brakes, and a 120mm/130mm FOX suspension package. IT'S RIGHT FOR YOU IF... You like balance in most things you do – a combination of climbing power and descending confidence, nimble handling and full-suspension comfort, bike budget and component performance. You like the durability and affordability that an alloy frame offers, and want upgrades where they matter most. 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 DPS shock with a 3-position damper. It's topped off with a wireless electronic SRAM GX Eagle transmission, 4-piston hydraulic disc brakes, a Bontrager Line dropper post, and Tubeless Ready Bontrager Line Comp 30 wheels. THE FINAL WORD Top Fuel 9 Gen 4 is built for those who want the best of both worlds. It's a great choice for all-around trail riders who may start the day with a pedal fest, but end it with long descents. It delivers on upgrades where you want them most, like your suspension and groupset, but keeps the price down with an alloy frame. 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 the sweetest alloy build with a fully wireless SRAM transmission, upgraded suspension, and a light yet rugged frame for all-mountain ripping - 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
- SRAM GX Eagle, T-Type, 12 speed
- Component Color
- Buff Beige, Juniper
- 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
- 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, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm length
- Component Shifters
- SRAM AXS POD
- 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, SRAM XD 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
- 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
- Fox Performance Float DPS, 2-position damper, 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, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm length
- Saddle
- Verse Short Comp, steel rails, 145mm width
- Handlebar
- Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width
- Rear Derailleur
- SRAM GX Eagle AXS, T-Type
- Rear Tire
- Bontrager Gunnison Pro XR, Tubeless Ready, wire bead, 60 tpi, 27.5x2.40''
- Stem
- Bontrager Elite, 35mm, 0 degree, 45mm length
- Brakes
- SRAM Level Bronze 4-piston hydraulic disc // SRAM Level Bronze 4-piston hydraulic disc
- 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
- SRAM AXS POD
- Tape/Grips
- Bontrager XR Trail Comp, nylon lock-on
- Color
- Juniper
- 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, 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.