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It's right for you if...

You’re looking for a do-it-all full suspension mountain bike that's efficient and fast, but doesn't shy away from some bigger stuff. You want the added stiffness and weight savings of a carbon frame, but don't mind saving some money on the parts.

The tech you get

A light and stiff full carbon frame, 120mm RockShox SID Select+ fork, 115mm of rear travel with a RockShox SID Luxe Ultimate shock, and a new Shimano XT 1x12 drivetrain. Plus, wide carbon Bontrager Kovee Elite 30 wheels with a 54-tooth Rapid Drive hub for fast engagement, Bontrager Line Elite Dropper, and carbon handlebars.

The final word

Top Fuel 9.8 is a ridiculously fun carbon down-country bike with upgraded parts that give you noticeable benefits on the trail, like more speed from the carbon wheels and more grip from the ultra-smooth suspension.

The Walkthrough

favorite_borderWhy you'll love it

  1. This bike wants to go fast—it's built with no-nonsense, high-performance parts
  2. You get a Straight Shot downtube for extra-stiff, responsive handling without added weight, and a Knock Block headset that protects against spinning bars and fork crowns
  3. Bontrager DropLock's shifter-style lever lets you easily lock out both front and rear shocks at the same time for added sprinting or climbing efficiently. Plus, it controls your dropper post too
  4. Wider Kovee Elite 30 wheels provide better tire support so you can run lower pressure and get more traction
  5. This short-travel bike has a killer suspension setup reminiscent of the all-mighty mullet—it's both efficient and ready to party

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Features

Will my bike have a curved top tube?

Will my bike have a curved top tube?

Smaller frames (S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. Larger frames (M and up) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

Active Braking Pivot

Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.

Learn more
Straight Shot downtube

Straight Shot downtube

Straight Shot downtube gives you an extra-stiff frame without adding any weight, so you can stick your line through the rough stuff and still fly up the next climb.

Rapid Drive 108 rear hub

Rapid Drive 108 rear hub

With 108 points of engagement, Rapid Drive gives you nearly instant acceleration instead of a clunky lag when you step on the pedals. You get smooth, immediate power to blast out of corners and hammer through the rough stuff. And that extra pedal ratchet adds control that can make all the difference when tackling a tricky climb.

OCLV Mountain Carbon

Trek's mountain-specific carbon fiber is tougher carbon, with unique materials and layup procedures, Trek's advanced engineering, and a higher standard of testing.

Learn more

Specifications

*spec applies to all sizes unless otherwise noted

Frameset
Fork RockShox SID Select+, DebonAir spring, Charger 2 RL damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 120mm travel
Shock RockShox SID Luxe Ultimate, DebonAir spring, Ultimate RL damper, 190x45mm
Suspension lever Bontrager Drop Lock remote
Drivetrain
Shifter Shimano XT M8100, 12 speed
Rear derailleur Shimano XT M8100, long cage, 51T max cog
*Crank Size: S
Shimano XT M8100, 32T alloy ring, Boost (52mm chainline), 170mm length
Size: M, M/L, L, XL
Shimano XT M8100, 32T alloy ring, Boost (52mm chainline), 175mm length
Bottom bracket Shimano MT500, 92mm, PressFit
Cassette Shimano XT M8100, 10-51, 12 speed
Chain Shimano XT M8100, 12 speed
Components
Saddle Bontrager Montrose Elite, titanium rails, 138mm width
*Seatpost Size: S
Bontrager Line Elite Dropper, 100mm travel, internal routing, 31.6mm, 340mm length
Size: M, M/L
Bontrager Line Elite Dropper, 150mm travel, internal routing, 31.6mm, 440mm length
Size: L, XL
Bontrager Line Elite Dropper, 170mm travel, internal routing, 31.6mm, 480mm length
Handlebar Bontrager Line Pro, OCLV Carbon, 35mm, 15mm rise, 750mm width
Grips Bontrager XR Trail Elite, alloy lock-on
*Stem Size: S, M, M/L
Bontrager Kovee Pro, 35mm, Knock Block, Blendr compatible, 13 degree, 60mm length
Size: L, XL
Bontrager Kovee Pro, 35mm, Knock Block, Blendr compatible, 13 degree, 70mm length
Headset Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom
Brake Shimano SLX M7000 hydraulic disc, 180mm front rotor, 160mm rear rotor
*Brake rotor Size: S, M, M/L, L, XL
Shimano RT66, 6-bolt, 180mm
Size: S, M, M/L, L, XL
Shimano RT66, 160mm, 6-bolt
Weight
Weight M - 11.83 kg / 26.08 lbs (with TLR sealant, no tubes)
Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
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, colors, and materials.
Bike and frame weights are based off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.

 

Rider Height

Inseam

All measurements provided in cm unless otherwise noted.

Frame size number Frame size letter Geometry position A — Seat tube B — Seat tube angle Effective seat tube angle C — Head tube length D — Head angle E — Effective top tube F — Bottom bracket height G — Bottom bracket drop H — Chainstay length I — Offset J — Trail K — Wheelbase L — Standover M — Frame reach N — Frame stack
15.5 S High 39.4 68.5° 75.5° 9 68.0° 56.3 34.3 3 43.4 4.4 10.3 111.7 73.1 41 59
15.5 S Low 39.4 68.0° 75.0° 9 67.5° 56.4 33.7 3.6 43.5 4.4 10.7 111.7 72.5 40.5 59.4
17.5 M Low 41.9 68.0° 75.0° 9 67.5° 59.9 33.7 3.6 43.5 4.4 10.7 115.2 73 44 59.4
17.5 M High 41.9 68.5° 75.5° 9 68.0° 59.8 34.3 3 43.4 4.4 10.3 115.2 73.6 44.5 59
18.5 ML High 44.5 68.5° 75.5° 9 68.0° 61.4 34.3 3 43.4 4.4 10.3 116.8 74.1 46.1 59
18.5 ML Low 44.5 68.0° 75.0° 9 67.5° 61.5 33.7 3.6 43.5 4.4 10.7 116.8 73.5 45.6 59.4
19.5 L High 47 68.5° 75.5° 10 68.0° 63 34.3 2.9 43.4 4.4 10.3 118.5 75.1 47.5 59.9
19.5 L Low 47 68.0° 75.0° 10 67.5° 63.2 33.7 3.6 43.5 4.4 10.7 118.6 74.5 47 60.3
21.5 XL High 52.1 68.5° 75.5° 11 68.0° 65 34.3 2.9 43.4 4.4 10.3 120.6 77.1 49.2 60.8
21.5 XL Low 52.1 68.0° 75.0° 11 67.5° 65.1 33.7 3.6 43.5 4.4 10.7 120.7 76.5 48.7 61.2

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