Trek Top Fuel 9 Gen 4 2025

Trek Top Fuel 9 Gen 4 2025


Regular price £4,500.00

Only 4 available!

The 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 aluminium frame, plus the upgrades you crave, like fully wireless shifting from SRAM's GX Eagle AXS transmission, 4-piston hydraulic brakes and a 120 mm/130 mm 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 Aluminium frame equipped with a 4-way Mino Link lower shock mount for tweaking geometry and suspension leverage rate. A 130 mm FOX Rhythm 34 fork with Float EVOL air spring and GRIP damper, plus 120 mm 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

The 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 group set, but keeps the price down with an alloy frame.


*spec applies to all sizes unless otherwise noted

Frame Alpha Platinum Aluminium, internal storage, tapered head tube, internal guided routing, downtube guard, OCLV Next rocker link, Mino 4 link, ABP, Boost148, 120 mm travel
Fork Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 130 mm travel
Shock Fox Performance Float DPS, 2-position damper, 185 mm x 50 mm
Max compatible fork travel 140 mm
*Wheel front Size: S
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5"
Size: M, ML, L, XL
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 29"
Wheel rear Bontrager Line Comp 30, Tubeless-Ready, Rapid Drive 54, 6-bolt, Boost148, 12 mm thru axle
Skewer rear Bontrager Switch thru-axle, removable lever
*Tyre Size: S
Bontrager Gunnison Pro XR, Tubeless-Ready, wire bead, 60 tpi, 27.5x2.40"
Size: M, ML, L, XL
Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40"
Tyre part Bontrager TLR sealant, 180 ml/6 oz
Rim strip Bontrager TLR
Max tyre size Frame: 29x2.50", Fork: See manufacturer
Battery SRAM eTap battery pack (with charger)
Rear derailleur SRAM GX Eagle AXS, T-Type
Crank SRAM GX Eagle, T-Type, DUB, 30T, 55 mm chain line, 170 mm length
Bottom bracket SRAM DUB MTB Wide, 73 m, BSA threaded
Cassette SRAM Eagle XS-1275, T-Type, 10-52, 12-speed
Chain SRAM GX Eagle, T-Type, 12-speed
Max. chainring size 1x: 34T, min 30T
Saddle Verse Short Comp, steel rails, 145 mm width
*Seatpost Size: S
Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9 mm, 310mm length
Size: M, ML, L, XL
Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 34.9 mm, 450 mm length
Handlebar Bontrager Line, alloy, 35 mm, 27.5 mm rise, 780 mm width
Grips Bontrager XR Trail Comp, nylon lock-on
Stem Bontrager Elite, 35 mm, 0-degree, 45 mm length
Brake SRAM Level Bronze 4-piston hydraulic disc
Brake rotor SRAM CentreLine, 6-bolt, round-edge, 180 mm
Rotor size Max brake rotor sizes – Frame: 200 mm, min 180 mm, Fork: see fork manufacturer
Weight M - 14.38 kg / 31.71 lbs (with TLR sealant, no tubes)
Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.

Bike and frame weights are based on pre-production painted frames at time of publication. Weights may vary in final production.