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2021 Trek Top Fuel 9.8 GX AXS Bike

Average User Rating: (Good)
2021 Trek Top Fuel 9.8 GX AXS (Gloss Red/Matte Carbon Smoke)
2021 Trek Top Fuel 9.8 GX AXS Bike 2021 Trek Top Fuel 9.8 GX AXS Bike 2021 Trek Top Fuel 9.8 GX AXS Bike 2021 Trek Top Fuel 9.8 GX AXS Bike 2021 Trek Top Fuel 9.8 GX AXS Bike 2021 Trek Top Fuel 9.8 GX AXS Bike
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Awesome Bike, Bad Rims

The Good:

I use this bike for XC trails and some mild trail riding around Richmond, VA. The trails I ride are fast, flowy, and smooth with a few small jumps sprinkled in and some mellow rock gardens. The bike has felt incredible on the trails. It's stable at speed, excellent at the climbs, and doesn't shy away from some air time.

The Bad:

I do think there are areas that could certainly use improvement. First and foremost, the carbon rims. I have owned and ridden the bike for a month. The trails I typically ride would not cause a person riding a full rigid bike much discomfort. Unfortunately, the Bontrager rim failed and cracked. Fortunately, the rims is covered by warranty. With the current state of the industry, a new one is not available until February. Obviously, this is a massive bummer because that means I have to wait six months to ride a bike I have had for one month. Now, I am a seasoned rider and definitely do not shy away from using a bike to it's full capacity. I do not believe I was using the Trek beyond its capabilities and strongly believe that the rim should have held up to the type of riding I was doing on it. It's possible that my rim was simply defective, but that is a fault that cannot be ignored and is worth noting. Hind sight being 20/20, I would have placed CushCore on the rims before ever riding it. The extra 150 bucks would have been worth the estimated six months off the bike I currently face. Beyond the rim, I think the XR3 tires are not the best in terms of grip or strength. Likewise, having extra hard points on the frame to mount accessories would have been nice.

Overall Review:

The bike has been fantastic and I would recommend it. It's a blast to ride when it has wheels!


Product Trek Top Fuel 9.8 GX AXS Bike
Model Year 2021
Riding Type Trail
Rider Unisex
Sizes and Geometry
SM (high, low), MD (high, low), ML (high, low), LG (high, low), XL (high, low) View Geometry
Size SM (high, low) MD (high, low) ML (high, low) LG (high, low) XL (high, low)
Top Tube Length 563mm, 564mm 598mm, 599mm 614mm, 615mm 630mm, 632mm 650mm, 651mm
Head Tube Angle 68.0°, 67.5° 68.0°, 67.5° 68.0°, 67.5° 68.0°, 67.5° 68.0°, 67.5°
Head Tube Length 90mm 90mm 90mm 100mm 110mm
Seat Tube Angle 75.5°, 75.0° 75.5°, 75.0° 75.5°, 75.0° 75.5°, 75.0° 75.5°, 75.0°
Seat Tube Length 394mm 419mm 445mm 470mm 521mm
Bottom Bracket Height 343mm (30mm drop), 337mm (36mm drop) 343mm (30mm drop), 337mm (36mm drop) 343mm (30mm drop), 337mm (36mm drop) 343mm (29mm drop), 337mm (36mm drop) 343mm (29mm drop), 337mm (36mm drop)
Chainstay Length 434mm, 435mm 434mm, 435mm 434mm, 435mm 434mm, 435mm 434mm, 435mm
Wheelbase 1117mm, 1117mm 1152mm, 1152mm 1168mm, 1168mm 1185mm, 1186mm 1206mm, 1207mm
Standover 731mm, 725mm 736mm, 730mm 741mm, 735mm 751mm, 745mm 771mm, 765mm
Reach 410mm, 405mm 445mm, 440mm 461mm, 456mm 475mm, 470mm 492mm, 487mm
Stack 590mm, 594mm 590mm, 594mm 590mm, 594mm 599mm, 603mm 608mm, 612mm
* Additional Info Geometry adjustable via Mino Link flip chip in upper shock mount
Wheel Size 29"
Frame Material Carbon Fiber
Frame Material Details OCLV Mountain Carbon main frame and stays, molded down tube and chainstay protection
Rear Travel 115mm
Rear Shock RockShox SIDLuxe Ultimate, DebonAir spring, Ultimate RL damper, 190mm x 45mm, Bontrager Drop Lock remote lockout
Fork RockShox SID Select+, DebonAir spring, Charger 2 RL damper, 44mm offset, Maxle Stealth axle, Bontrager Drop Lock remote lockout
Fork Travel 120mm
Head Tube Diameter Tapered, 1.125" top, 1.5" bottom
Headset Trek Knock Block Integrated, 58° radius, cartridge bearings
Handlebar Bontrager Line Pro, OCLV Carbon, 35mm clamp diameter, 15mm rise, 750mm width
Stem Bontrager Kovee Pro, 35mm bar clamp, Knock Block and Blendr compatible, 13° drop/rise, 60mm length
Grips Bontrager XR Trail Elite, nylon lock-on
Brakes SRAM G2 RS, 4-piston, SRAM CenterLine 6-bolt round-edge rotors (180mm front, 160mm rear)
Brake Levers SRAM G2 RS
Drivetrain 1x
Shifters SRAM GX Eagle AXS Controller, 12-speed, electronic wireless
Front Derailleur None
Rear Derailleur SRAM GX Eagle AXS, 12-speed, electronic wireless
ISCG Tabs None
Chainguide MRP upper slider
Cranks SRAM GX Eagle DUB
Length: 170mm (SM), 175mm (MD/ML/LG/XL)
Chainrings SRAM GX Eagle, 32 tooth, alloy
Bottom Bracket SRAM DUB, 92mm PressFit
Pedals None
Chain SRAM GX Eagle, 12-speed
Cassette SRAM GX Eagle XG-1275, 12-speed, 10-52 tooth
Rims Bontrager Kovee Elite 30, carbon, tubeless ready
Hubs Bontrager Kovee Elite 30 wheelset, 110x15mm Boost front, 148x12mm Boost rear with 54-tooth Rapid Drive freehub and XD driver
Spokes Bontrager Kovee Elite 30 wheelset
Tires Bontrager XR3 Team Issue, tubeless ready, Inner Strength sidewalls, aramid bead, 120 TPI, 29" x 2.4"
Saddle Bontrager Montrose Elite, titanium rails, 138mm width
Seatpost Bontrager Line Elite dropper
Drop: 100mm (SM), 150mm (MD/ML), 170mm (LG/XL)
Seatpost Diameter 31.6mm
Seatpost Clamp Single bolt, 36.4mm
Rear Dropout / Hub Dimensions 148x12mm Boost
Max. Tire Size 29" x 2.4"
Bottle Cage Mounts One inside front triangle
Colors Matte Raw Carbon/Voodoo Trek Black, Gloss Red/Matte Carbon Smoke, Carbon Blue Smoke/Radioactive Coral
Warranty Lifetime frame and wheels; 2 years Trek/Bontrager parts, suspension linkage components, and paint/decals
Weight 26 lb 3.1 oz (11,880 g)
Miscellaneous • ABP (Active Braking Pivot) suspension system
• Geometry adjustable via Mino Link flip chip in upper shock mount
• Straight Shot frame design with Knock Block steerer stop
• Control Freak internal cable routing
• Weight given for MD frame with tire sealant (no tubes)
• Includes Bontrager TLR rim strips, tubeless valves, and sealant
• Photos may show non-AXS builds
Price $7,199.99
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