2025 Top Fuel 8 Gen 4

The Top Fuel 8 Gen 4 is a nimble alloy trail bike that strikes a balance between quick climbing efficiency and descending confidence. It packs in a versatile 130 mm front and 120 mm rear travel for ripping over rocks and roots without sacrificing power on ascents. It's built from lightweight Alpha Platinum Aluminium that helps save your budget for bike trips, but packs in upgrades where they matter, like a 12-speed Shimano XT and SLX drivetrain, and a Fox Rhythm 34 fork.

Specifications:

Frame

Alpha Platinum Aluminium, internal storage, tapered head tube, internal guided routing, downtube guard, OCLV Next rocker link, Mino 4 link, ABP, Boost148, 120 mm travel

Shock

Fox Performance Float DPS, 2-position damper, 185 mm x 50 mm

Fork

Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 130 mm travel

Brakes

Shimano 4-piston hydraulic disc, M6100 lever, M6120 calliper

Shifters

Shimano XT M8100, 12-speed

Front Derailleur

N/A

Rear Derailleur

Shimano XT M8100, long cage

Cassette

Shimano SLX M7100, 10-51T, 12-speed

Crankset

Shimano Deore M6120, 30T ring, 55 mm chainline, 170 mm length

Wheel Front

Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle

Wheel Rear

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

Tyres

Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi

Seatpost

Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 34.9 mm

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