Description
Trek Top Fuel 9.8 GX AXS Mountain Bike 2021 – Medium/Large MTB
Trek Top Fuel 9.8 GX AXS is a 2021 full-suspension carbon trail bike designed for riders who want speed, efficiency, and confidence across all terrains. Built with a lightweight OCLV Mountain Carbon frame, this bike merges the climbing efficiency of a cross-country race machine with the control and capability of a modern trail bike.
The 2021 Trek Top Fuel 9.8 GX features 120mm front and rear suspension travel, progressive geometry, and the ultra-reliable SRAM GX Eagle AXS wireless drivetrain. Whether you’re chasing podiums, pushing through long endurance rides, or tackling technical singletrack, the Trek Top Fuel 9.8 GX AXS offers the perfect balance of speed and capability.
Compared to previous models, the Trek Top Fuel 9.8 GX 2021 introduces an updated suspension kinematic, a slacker head tube angle, and longer reach, making it more capable on steep descents without sacrificing pedaling efficiency. Riders who’ve looked into the Trek Top Fuel 9.8 GX review consistently highlight its precision handling, lightweight feel, and versatility on everything from flow trails to all-day epic rides.
Key Features
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Frame: OCLV Mountain Carbon main frame and stays for stiffness and durability.
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Suspension: 120mm RockShox SID Select+ fork paired with a RockShox Deluxe Ultimate rear shock for a plush yet efficient ride.
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Drivetrain: Wireless SRAM GX Eagle AXS 12-speed shifting – crisp, accurate, and low-maintenance.
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Brakes: Shimano Deore XT 4-piston hydraulic disc brakes deliver powerful stopping power.
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Wheels: Bontrager Line Elite 30 carbon wheels with Rapid Drive 108 hubs for instant engagement.
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Tires: Tubeless-ready 29×2.4” Bontrager XR3 Team Issue – traction-focused and fast rolling.
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Dropper Post: Bontrager Line Elite Dropper, giving confidence on technical descents.
The Trek Top 9.8 Fuel GX AXS Mountain Bike 2021 – Medium/Large blends the best of cross-country speed and trail toughness into one fast, agile full suspension MTB. Built with a lightweight Alpha Platinum Aluminum frame and equipped with a 120mm front / 115mm rear suspension setup, it’s tuned for flowy descents, punchy climbs, and all-day trail adventures. Outfitted with a SRAM GX Eagle 12-speed drivetrain, RockShox suspension, and fast-rolling 29″ Bontrager wheels, the Top Fuel GX offers responsive handling and efficient pedaling—perfect for aggressive riders looking to push limits on every ride.
Trek Top Fuel 9.8 GX AXS Specifications
Details
| Year | 2021 |
| Brand | Trek |
| Model | Top Fuel |
| Size | Med/Large |
| Frame Material | Carbon Fiber |
| Drivetrain | SRAM, 1×12 spd |
| Weight | 28 lbs 5 oz |
Build
| Fork | FOX Performance 34 FLOAT Step-Cast |
| Fork Travel | 120mm |
| Rear Shock | FOX Performance FLOAT DPS |
| Rear Shock Travel | 115mm |
| Brakes | Shimano SLX M7000, Disc Brakes – Hydraulic |
| Shifters | SRAM GX Eagle, Mechanical |
| Rear Derailleur | SRAM GX Eagle |
| Bottom Bracket Shell | Press fit |
| Crankset | Truvativ Descendant Alloy, 32t, 175mm |
| Cassette | SRAM XG-1275 Eagle, 10-50t |
| Chain | Shimano |
| Handlebar | Bontrager Line Pro Carbon, 750mm |
| Headset | Integrated |
| Stem | Bontrager Alloy, 35.0mm x 60mm, 13° |
| Seatpost | Bontrager Line Elite, 31.6mm |
| Seatpost Travel | 100mm |
| Saddle | Bontrager Montrose Elite Hollow w/ Titanium Rails |
| Front Axle Spacing | 15x110mm (Boost) |
| Rear Axle Spacing | 12x148mm Boost |
| Wheelset | Stan’s NoTubes Flow S2 Aluminum Tubeless Compatible , Stan’s NoTubes E Sync |
| Front Tire | Teravail Honcho TR, 29″ x 2.4″ |
| Rear Tire | Teravail Honcho TR, 29″ x 2.4″ |
| Tire Type | Tubeless |
| Tubeless Compatibility | Bike ships tubeless |
| Pedals | Sold separately |
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