Trek Top Fuel 9.9 XTR Gen 4 2025

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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 120mm/130mm 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.

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

Drivetrain

Shifter	Shimano XTR M9100, 12 speed
Rear derailleur	Shimano XTR M9100, Shadow Plus, long cage, 51T max cog
Crank	E*thirteen TRS Race Carbon, 30T, 55mm chainline, 170mm length
Bottom bracket	E*thirteen BB20-P, BSA threaded, 73mm 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, 145mm width
*Seatpost	Size: S Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm length
*Seatpost	Size: M, ML, L, XL Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 4500mm 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
Grips	Bontrager XR Trail Elite, nylon lock-on
Brake	Shimano XTR M9100 hydraulic disc
Brake rotor	Shimano RT86, 6-bolt, 180mm
Rotor size	Max brake rotor sizes - Frame: 200mm, min 180mm, Fork: see fork manufacturer

Accessories

Bag	Bontrager BITS Internal Frame Storage Bag

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 300 pounds (136 kg).

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