Trek
Top Fuel 9.8 GX AXS Gen 4
Top Fuel 9.8 GX AXS Gen 4
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The Top Fuel 9.8 GX AXS Gen 4 is a lightweight carbon trail bike built to rip up climbs and stay playful on descents. It gives you the confidence you want through roots and rocks, thanks to a 120 mm/130 mm RockShox suspension package with a Pike Select+ fork and Deluxe Ultimate shock. Plus, you can shift easy even under load with a SRAM GX Eagle AXS wireless transmission.
*Frame |
Size: XL, L, S, M, ML
OCLV Mountain Carbon, 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 |
Size: XL, L, S , M, ML
RockShox Pike Select+, DebonAir spring, Charger 3.1 RC2 damper, tapered steerer, 44 mm offset, Boost110, 15 mm Maxel Stealth, 130 mm travel
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*Shock |
Size: XL, L, S , M, ML
RockShox Deluxe Ultimate RCT, 185 mm x 50 mm
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*Wheel front |
Size: S
Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5"
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Size: XL, L, M, ML 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, SRAM XD freehub, Boost148, 12 mm thru axle, 27.5"
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Size: XL, L, M, ML Bontrager Line Comp 30, High Strength 6000 Series Aluminium rim, Tubeless-Ready, Rapid Drive 108, 6-bolt, SRAM XD freehub, Boost148, 12 mm thru axle, 29" | |
*Skewer rear | Size: XL, L, S, M, ML Bontrager Switch thru-axle, removable lever |
*Tyre |
Size: S
Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40"
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Size: XL, L, M, ML Bontrager Montrose RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 29x2.40" | |
Size: XL, L, M, ML Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 29x2.40" | |
*Tyre part |
Size: XL, L, S, M, ML
Bontrager TLR sealant, 180 ml/6 oz
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*Rim strip |
Size: XL, L, S, M, ML
Bontrager TLR
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Max tyre size | Frame: 29x2.50", Fork: See manufacturer |
*Battery |
Size: XL, L, S, M, ML
SRAM AXS battery pack (with charger)
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*Shifter |
Size: XL, L, S, M, ML
SRAM AXS POD
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*Rear derailleur |
Size: XL, L, S, M, ML
SRAM GX Eagle AXS, T-Type
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*Crank |
Size: XL, L, S, M, ML
SRAM GX Eagle, T-Type, DUB, 30T, 55 mm chain line, 170 mm length
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*Bottom bracket |
Size: XL, L, S, M, ML
SRAM DUB MTB Wide, 73 m, BSA threaded
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*Cassette |
Size: XL, L, S, M, ML
SRAM Eagle XS-1275, T-Type, 10-52, 12-speed
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*Chain |
Size: XL, L, S, M, ML
SRAM GX Eagle, T-Type, 12-speed
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Max. chainring size | 1x: 34T, min 30T |
*Saddle |
Size: XL, L, S, M, ML
Verse Short Comp, steel rails, 145 mm width
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*Seat post | Size: S Bontrager Line Dropper, 100mm travel, Maxflow, internal routing, 34.9 mm, 310mm length |
Size: XL, L, M, ML Bontrager Line Dropper, 170 mm travel, Maxflow, internal routing, 34.9 mm, 450 mm length | |
*Handlebar/stem (integrated) | Size: S Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5 mm handlebar rise, 820 mm width, 0-degree stem rise, 35 mm stem length |
Size: XL, L, M, ML Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5 mm handlebar rise, 820 mm width, 0-degree stem rise, 45mm stem length | |
*Grips | Size: XL, L, S , M, Bontrager XR Trail Elite, nylon lock-on |
*Brake |
Size: XL, L, S , M, ML
SRAM Level Bronze 4-piston hydraulic disc
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*Brake rotor |
Size: XL, L, S, M, ML
SRAM Centreline, 6-bolt, round-edge, 180 mm
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Rotor size | Max brake rotor sizes – Frame: 200 mm, min 180 mm, Fork: see fork manufacturer |
Weight | M - 13.20 kg / 29.11 lbs (with TLR sealant, no tubes) |
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Weight limits | 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.

