Trek Top Fuel 9.9 X0 AXS T-Type Gen 4 2025

Home / Trek Top Fuel 9.9 X0 AXS T-Type Gen 4 2025

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Top Fuel 9.9 X0 AXS Gen 4 is an ultra-light and capable carbon trail bike that's built for soaring up climbs and rallying over miles of singletrack. This top-level build delivers the performance you want, with a RockShox Ultimate suspension package (120mm/130mm), and SRAM's wireless X0 AXS transmission that shifts smooth and easy, especially under load. It's topped off with carbon wheels to keep your ride light from top to bottom.

Frame	OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120mm travel
Fork	RockShox Pike Ultimate, DebonAir spring, Charger 3.1 RC2 damper, 44mm offset, Boost110, Maxle Stealth, 130mm travel
Shock	RockShox Deluxe Ultimate RCT, 185mm x 50mm
Max compatible fork travel	140mm

Wheels

*Wheel front	Size: S Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 27.5''
*Wheel front	Size: M, ML, L, XL Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29''
*Wheel rear	Size: S Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost148, 12mm thru axle, 27.5''
*Wheel rear	Size: M, ML, L, XL Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost148, 12mm thru axle, 29''
Skewer rear	Bontrager Switch thru axle, removable lever
*Tire	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''
Tire part	Bontrager TLR sealant, 180 ml/6 oz
Max tire size	Frame: 29x2.50", Fork: See manufacturer

E-system

Battery	SRAM eTap battery pack (with charger)

Drivetrain

*Shifter	Size: S , M, ML, L, XL SRAM AXS POD
*Shifter	Size: S , M, ML, L, XL SRAM AXS POD, paired with dropper
Rear derailleur	SRAM X0 Eagle AXS, T-Type
Crank	SRAM X0 Eagle, DUB, 30T steel, T-Type, 55mm chainline, 170mm length
Bottom bracket	SRAM DUB MTB Wide, 73mm, BSA threaded
Cassette	SRAM Eagle XS-1295, T-Type, 10-52, 12 speed
Chain	SRAM X0 Eagle, T-Type, 12 speed
Max chainring size	1x: 34T, min 30T

Components

Saddle	Verse Short Pro, carbon rails, 145mm width
*Seatpost	Size: S RockShox Reverb AXS, 100mm travel, wireless, 34.9mm, 340mm length
*Seatpost	Size: M, ML, L, XL RockShox Reverb AXS, 170mm travel, wireless, 34.9mm, 480mm length
*Handlebar/stem (integrated)	Size: S Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm handlebar rise, 820mm width, 0 degree stem rise, 35mm stem length
*Handlebar/stem (integrated)	Size: M, ML, L, XL Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm handlebar rise, 820mm width, 0 degree stem rise, 45mm stem length
*Brake	Size: S , M, ML, L, XL SRAM Level Silver 4-piston hydraulic disc
*Brake	Size: S , M, ML, L, XL SRAM Level Silver Stealth 4-piston hydraulic disc
Brake rotor	SRAM HS2, 6-bolt, 180mm
Rotor size	Max brake rotor sizes - Frame: 200mm, min 180mm, Fork: see fork manufacturer

Weight

Weight	M - 13.10 kg / 28.89 lbs (with TLR sealant, no tubes)
Weight limit	This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).

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