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Trek Top Fuel 9.9 XTR Gen 4 2025

£8,000.00 £3,200.00 60% OFF

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The Top Fuel 9.9 XTR 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 120 mm/130 mm RockShox suspension package with a Pike Ultimate fork and Deluxe Ultimate shock. Plus, you get clean shifts from a premium 12-speed Shimano XTR drivetrain.

 


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 light yet precise shifting of a Shimano XTR drivetrain.

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 130 mm RockShox Pike Ultimate fork with DebonAir spring, and Charger 3.1 RC2 damper, plus 120 mm of rear travel from a RockShox Deluxe Ultimate RCT shock. A Shimano XTR 12-speed drivetrain, Shimano XTR M9100 hydraulic brakes, Bontrager Line dropper post and tubeless-ready Bontrager Line Pro 30 wheels.

The final word

If you're after a light carbon trail bike that balances a playful and capable ride, reach for the Top Fuel 9.8 XTR 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 clean shifts from a Shimano XTR drivetrain and a sweet RockShox suspension package.

Specifications

Frame OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120 mm travel
Fork RockShox Pike Ultimate, DebonAir spring, Charger 3.1 RC2 damper, 44 mm offset, Boost110, Maxle Stealth, 130 mm travel
Shock RockShox Deluxe Ultimate RCT, 185 mm x 50 mm
Max compatible fork travel 140 mm
Wheels
*Wheel front Size: S
Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15 mm thru-axle, 27.5"
Size: M, ML, L, XL
Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15 mm thru-axle, 29"
*Wheel rear Size: S
Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless-Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle, 27.5"
Size: M, ML, L, XL
Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless-Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle, 29"
Skewer rear Bontrager Switch thru-axle, removable lever
*Tyre Size: S
Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40"
Size: M, ML, L, XL
Bontrager Montrose RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 29x2.40"
Size: M, ML, L, XL
Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 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
Drivetrain
Shifter Shimano XTR M9100, 12-speed
Rear derailleur Shimano XTR M9100, Shadow Plus, long cage, 51-T max cog
Crank E*thirteen TRS Race Carbon, 30T, 55 mm chain line, 170 mm length
Bottom bracket E*thirteen BB20-P, BSA threaded, 73 mm width
Cassette Shimano XTR M9101, 10-51, 12-speed
Chain Shimano Dura-Ace/XTR M9100, 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/stem (integrated) Size: S
Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5 mm handlebar rise, 820 mm width, 0-degree stem rise, 35 mm stem length
Size: M, ML, L, XL
Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5 mm handlebar rise, 820 mm width, 0-degree stem rise, 45mm stem length
Grips Bontrager XR Trail Elite, nylon lock-on
Brake Shimano XTR M9100 hydraulic disc
Brake rotor Shimano RT86, 6-bolt, 180 mm
Rotor size Max brake rotor sizes – Frame: 200 mm, min 180 mm, Fork: see fork manufacturer
Weight
Weight M - 12.63 kg / 27.85 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.

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