Trek Top Fuel 8 Gen 4 2025

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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 130mm front and 120mm rear travel for ripping over rocks and roots without sacrificing power on ascents. It's built from lightweight Alpha Platinum Aluminum 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.

Frame

Alpha Platinum Aluminium, internal storage, tapered head tube, Knock Block 2.0, internal guided routing, downtube guard, magnesium rocker link, Mino Link, ABP, Boost148, 120 mm travel

Fork

RockShox Pike, DebonAir spring, Rush RC damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 130mm travel

Shock

RockShox Deluxe Ultimate RCT, 185mm x 50mm

Max compatible fork travel

Frame	Alpha Platinum Aluminum, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120mm travel
Fork	Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 130mm travel
Shock	Fox Performance Float DPS, 2-position damper, 185mm x 50mm
Max compatible fork travel	140mm

Wheels

*Wheel front	Size: S Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 27.5''
*Wheel front	Size: M, ML, L, XL Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29''
*Wheel rear	Size: S Bontrager Line Comp 30, High Strength 6000 Series Aluminum rim, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 27.5''
*Wheel rear	Size: M, ML, L, XL Bontrager Line Comp 30, High Strength 6000 Series Aluminum rim, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 29''
Skewer rear	Bontrager Switch thru axle, removable lever
*Tire	Size: S Bontrager Gunnison Pro XR, Tubeless Ready, wire bead, 60 tpi, 27.5x2.40''
*Tire	Size: M, ML, L, XL Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40''
Tire part	Bontrager TLR sealant, 180 ml/6 oz
Max tire size	Frame: 29x2.50", Fork: See manufacturer

Drivetrain

Shifter	Shimano XT M8100, 12 speed
Rear derailleur	Shimano XT M8100, long cage
Crank	Shimano Deore M6120, 30T ring, 55 mm chainline, 170 mm length
Bottom bracket	Shimano BB-MT501 BSA
Cassette	Shimano SLX M7100, 10-51T, 12 speed
Chain	Shimano SLX M7100, 12 speed
Max chainring size	1x: 34T, min 30T

Components

Saddle	Bontrager Verse P3, chromoly rails
*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	Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width
Grips	Bontrager XR Trail Comp, nylon lock-on
Stem	Bontrager Elite, 35mm, 0 degree, 45mm length
*Brake	Size: S , M, ML, L, XL Shimano M6120 4-piston hydraulic disc
*Brake	Size: S , M, ML, L, XL Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper
Brake rotor	Shimano RT66, 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 - 14.58 kg / 32.15 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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