Top Fuel 9.8 XT Gen 4 - 2025

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 XT 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 Select+ 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 XT 12-speed drivetrain, Shimano XT 4-piston hydraulic brakes, Bontrager Line dropper post and tubeless-ready Bontrager Line Comp 30 wheels.

The final word

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

Why you'll love it

• The 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 120 mm rear and 130 mm front RockShox 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 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: 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 Select+, DebonAir spring, Charger 3.1 RC2 damper, tapered steerer, 44 mm offset, Boost110, 15 mm 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 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, High Strength 6000 Series Aluminium rim, Tubeless-Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12 mm thru axle, 27.5"

- Size: M, ML, L, XL | Bontrager Line Comp 30, High Strength 6000 Series Aluminium rim, Tubeless-Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, 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"

Rim strip: Bontrager TLR

Max tyre size: Frame: 29x2.50", Fork: See manufacturer

DRIVETRAIN

Shifter: Shimano XT M8100, 12-speed

Rear derailleur: Shimano XT M8100, long cage

Crank: Shimano XT M8120, 30T, 55 mm chain line, 170 mm length

Bottom bracket: Shimano BB-MT501 BSA

Cassette: Shimano XT M8100, 10-51, 12-speed

Chain: Shimano Ultegra/XT M8100, 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 XT M8120 4-piston 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

ACCESSORIES

Bag: Bontrager BITS Internal Frame Storage Bag

WEIGHT

Weight: M - 13.45 kg / 29.66 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.