Trek Top Fuel 9 Gen 4 - 2025

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.
• 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 Aluminium 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 140 mm forks and longer-stroke shocks for up to 130 mm of rear travel, plus room for extra-long dropper posts

SPECS

FRAMESET

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

WHEELS

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: 

- Size: S: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 27.5''

- Size: M, ML, L, XL: 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

E-SYSTEM

Battery: SRAM eTap battery pack (with charger)

DRIVETRAIN

Shifter: SRAM AXS POD

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

COMPONENTS

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

ACCESSORIES

Bag: Bontrager BITS Internal Frame Storage Bag

WEIGHT

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).

The manufacturer reserves 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. The prices shown are the manufacturer's suggested retail prices.