Top Fuel 9.9 X0 AXS Gen 4
Top Fuel 9.9 X0 AXS Gen 4 is an ultra-light and capable carbon trail bike 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 smoothly and easily, especially under load. It’s topped off with carbon wheels to keep your ride light from top to bottom.
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Product images may vary slightly from final specifications.
Need to Know
KEY FEATURES
PERFECT FOR
Why we like the Trek Top Fuel 9.9 X0 AXS Gen 4
Ultra-Light Frame and Versatile Geometry
The OCLV Mountain Carbon frame is extremely lightweight and features adjustable geometry, making it suitable for a wide range of riding conditions and styles.
High-End Wireless Drivetrain
Equipped with the SRAM X0 Eagle AXS transmission, this bike ensures precise and reliable wireless shifting, enhancing the overall riding experience.
Premium Suspension and Carbon Wheels
The RockShox Ultimate suspension package paired with Bontrager Line Pro 30 carbon wheels provides a smooth and responsive ride on various terrains.
Specifications
Frame
Carbon Fibre
Fork
RockShox Pike Ultimate, DebonAir spring, Charger 3.1 RC2 damper, 44mm offset, Boost110, Maxle Stealth
Front Travel
130mm
Shock
RockShox Deluxe Ultimate RCT, 185mm x 50mm
Rear Travel
120mm
Drivetrain
Shifter
SRAM AXS POD
Rear Derailleur
SRAM X0 Eagle AXS, T-Type
Crankset
SRAM X0 Eagle, DUB, 30T steel, T-Type, 55mm chainline, 170mm length
Chain
SRAM X0 Eagle, T-Type, 12 speed
Cassette
SRAM Eagle XS-1295, T-Type, 10-52, 12 speed
Brakeset
SRAM Level Silver Stealth 4-piston hydraulic disc
Rotors
SRAM HS2, 6-bolt, 180mm
Bottom bracket
SRAM DUB MTB Wide, 73mm, BSA threaded
Cockpit
Headset
Integrated, cartridge bearing, 1-1/8” top, 1.5” bottom
Handlebar
Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm rise, 820mm width
Stem
Bontrager RSL Integrated handlebar/stem, 0 degree stem rise, 35mm stem length (S); 45mm stem length (M, ML, L, XL)
Saddle
Verse Short Pro, carbon rails, 145mm width
Dropper Post
RockShox Reverb AXS, 100mm travel (S); 170mm travel (M, ML, L, XL), wireless, 34.9mm
Dropper Lever
RockShox Reverb AXS
Grips
Bontrager XR Trail Elite, nylon lock-on
Wheels
Wheelset
Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle (front); Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost148, 12mm thru axle (rear)
Front Axle
Bontrager alloy, 6-bolt, Boost110, 15 mm thru-axle
Rear Axle
Bontrager alloy, sealed bearing, 6-bolt, Boost148, 12mm thru axle
Hubs
Bontrager
Tires
Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40” (S); Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40” (M, ML, L, XL)
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