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 |
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| 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 |
| Max compatible fork travel | 140 mm |
| *Wheel front |
Size: S Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5" |
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Size: M, ML, L, XL Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 29" |
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| *Wheel rear |
Size: S 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, 27.5" |
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Size: M, ML, L, XL 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, 29" |
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| Skewer rear | Bontrager Switch thru-axle, removable lever |
| *Tyre |
Size: S Bontrager Gunnison Pro XR, Tubeless-Ready, wire bead, 60 tpi, 27.5x2.40" |
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Size: M, ML, L, XL Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40" |
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| Tyre part | Bontrager TLR sealant, 180 ml/6 oz |
| Max tyre size | Frame: 29x2.50", Fork: See manufacturer |
| Shifter | Shimano XT M8100, 12-speed |
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| 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 |
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| *Seatpost |
Size: S Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9 mm, 310mm length |
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Size: M, ML, L, XL Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 34.9 mm, 450 mm length |
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| Handlebar | Bontrager Line, alloy, 35 mm, 27.5 mm rise, 780 mm width |
| Grips | Bontrager XR Trail 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 | Shimano RT66, 6-bolt, 180 mm |
| Rotor size | Max brake rotor sizes – Frame: 200 mm, min 180 mm, Fork: see fork manufacturer |
| Bag | Bontrager BITS Internal Frame Storage Bag |
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| Weight | M - 14.58 kg / 32.15 lbs (with TLR sealant, no tubes) |
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| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb). |
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice.
Bike and frame weights are based on pre-production painted frames at time of publication. Weights may vary in final production.