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.

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

*Wheel front: Size: S
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5"

Size: S
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru-axle, 27.5"

Size: M, ML, L, XL
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 29"

Size: M, ML, L, XL
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru-axle, 29"
*Wheel rear: Size: S

Bontrager Line Comp 30, High Strength 6000 Series Aluminium rim, Tubeless-Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12 mm thru axle, 27.5"

Size: S

Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12 mm thru-axle, 27.5"

Size: M, ML, L, XL

Bontrager Line Comp 30, High Strength 6000 Series Aluminium rim, Tubeless-Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12 mm thru axle, 29"

Size: M, ML, L, XL

Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12 mm thru-axle, 29"
Skewer rear: Bontrager Switch thru axle, removable lever
*Tyre: Size: S

Bontrager Gunnison Pro XR, Tubeless-Ready, wire bead, 60 tpi, 27.5x2.40"

Size: M, ML, L, XL

Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40"
Tyre part: Bontrager TLR sealant, 180 ml/6 oz
Max tyre size: Frame: 29x2.50", Fork: See manufacturer

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

Saddle: Bontrager Verse P3, chromoly rails
*Seatpost: Size: S
Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9 mm, 310mm length

Size: M, ML, L, XL
Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 34.9 mm, 450 mm length
Handlebar: Bontrager Line, alloy, 35 mm, 27.5 mm rise, 780 mm width
*Grips: Size: S , M, ML, L, XL
Bontrager XR Trail Comp, nylon lock-on

Size: S , M, ML, L, XL
Trek Line Comp, nylon lock-on
Stem: Bontrager Elite, 35 mm, 0-degree, 45 mm length
Brake: Shimano 4-piston hydraulic disc, M6100 lever, M6120 calliper
*Brake rotor: Size: S , M, ML, L, XL

Shimano RT66, 6-bolt, 180 mm

Size: S , M, ML, L, XL

Shimano RT66, 6-bolt, 180mm
Rotor size: Max brake rotor sizes – Frame: 200 mm, min 180 mm, Fork: see fork manufacturer

Bag: Bontrager BITS Internal Frame Storage Bag

Weight: M – 14.58 kg/32.15 lb (with TLR sealant, no tubes)
Weight limit: This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

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