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, 120 mm RockShox SID Select+ fork, 120 mm of rear travel with a SID Luxe shock and a SRAM GX Eagle drivetrain with an extra-low 52-tooth climbing gear. Plus, wide carbon Bontrager Line Elite 30 wheels with a 108-tooth Rapid Drive hub for instant 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.
favorite_borderWhy you'll love it
- Wider Line Elite 30 wheels provide better tyre support so you can run lower pressure and get more traction
- A sleek internal storage compartment gives you a versatile spot to stow tools and gear
- This bike’s killer suspension set-up is both efficient and ready to party
- New, removable Knock Block has a bigger steering angle to keep cables and hoses safe without sacrificing turning radius
This is a really, really good bike
The Top Fuel is a very capable descender, but its well-proportioned geometry is just half the story. It manages to strike a great balance between grip, tracking and precision. The whole bike seems to just will you on to hit things faster and with more precision.Read more
This thing rips
The new Top Fuel is also much more composed on rough and fast descents. Thanks to the longer reach and slacker head angle, the overall wheelbase length has grown by almost 40 mm. That’s huge, and it offers a vastly more planted feel at speed. Along with the big tyres and active suspension, this really is a solid little trail bike.Read more
Quick and in control
120 mm of rear travel combined with progressive trail geometry gives you a fast, responsive ride that helps you keep your cool when the trail turns rowdy.
Will my bike have a curved top tube?
The smaller frames (XS and S) have a curved top tube. This design makes for a lower standover height, which allows shorter riders to straddle the bike more easily. The 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.
Carbon Care Wheel Loyalty Programme
Every set of Bontrager carbon wheels is backed by the Carbon Care Wheel Loyalty Programme. In the unlikely event that you damage your Bontrager carbon wheels within the first two years of ownership, we’ll repair or replace them for free.
Oversized 34.9mm dropper post
Bigger is better. The oversized seat tube diameter gives more support and strength for longer travel droppers, and allows for more robust, durable internals that work faster.
Threaded bottom bracket
More robust than pressfit, threaded BBs hold up in nasty conditions and make servicing easier.
International Standard Chain-Guide mounts offer easy chain-guide installation and adjustment.
*spec applies to all sizes unless otherwise noted
|Frame||OCLV Mountain Carbon, internal storage, tapered head tube, Knock Block 2.0, internal guided routing, downtube guard, magnesium rocker link, Mino Link, ABP, Boost148, 120 mm travel|
|Fork||RockShox SID Select+, DebonAir spring, Charger 2 RL damper, tapered steerer, 44 mm offset, Boost110, 15 mm Maxle Stealth, 120 mm travel|
|Shock||RockShox Deluxe Ultimate RCT, 185 mm x 50 mm|
|Max compatible fork travel||130mm (541mm axle-to-crown)|
|Wheel front||Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle|
|Wheel rear||Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost 148, 12 mm thru axle|
|Skewer rear||Bontrager Switch thru axle, removable lever|
|Rim||Bontrager Line Elite 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle|
|Tyre||Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 29.x2.40"|
|Tyre part||Bontrager TLR sealant, 180 ml/6 oz|
|Rim strip||Bontrager TLR|
|Max tyre size||Frame: 29x2.5" Fork: see manufacturer|
|Shifter||SRAM GX Eagle, 12-speed|
|Rear derailleur||SRAM GX Eagle|
S, M, M/L, L
SRAM GX Eagle, DUB MTB Wide, 30T, 55 mm chainline, 170 length
SRAM GX Eagle, DUB MTB Wide, 30T, 55 mm chainline, 175 length
|Bottom bracket||SRAM DUB MTB Wide, 73 m, BSA threaded|
|Cassette||SRAM Eagle XG-1275, 10-52, 12-speed|
|Chain||SRAM GX Eagle, 12-speed|
|Max. chainring size||Max: 36T (oval - 34T) Min: 28T|
|Saddle||Bontrager Arvada, austenite rails, 138 mm width|
Bontrager Line Elite Dropper, 100 mm travel, MaxFlow, internal routing, 34.9 mm, 345 mm length
Bontrager Line Elite Dropper, 150 mm travel, MaxFlow, internal routing, 34.9 mm, 440 mm length
Bontrager Line Elite Dropper, 170 mm travel, MaxFlow, internal routing, 34.9 mm, 485 mm length
Bontrager Line Elite Dropper, 200 mm travel, MaxFlow, internal routing, 34.9 mm, 550 mm length
Bontrager Line Pro, OCLV Carbon, 35 mm, 15 mm rise, 750 mm width
M, M/L, L, XL
Bontrager Line Pro, OCLV Carbon, 35 mm, 27.5 mm rise, 780 mm width
|Grips||Bontrager XR Trail Elite, nylon lock-on|
|Stem||Bontrager Line Pro, 35 mm, Knock Block, Blendr-compatible, 0-degree, 45 mm length|
|Head set||Knock Block 2.0 Integrated, 72-degree radius (includes infinite-radius chip), sealed cartridge bearing, 1-1/8" top, 1.5" bottom|
|Brake||SRAM G2 RS hydraulic disc|
S, M, M/L, L, XL
SRAM CenterLine, 6-bolt, round-edge, 160 mm
S, M, M/L, L, XL
SRAM CenterLine, 6-bolt, round edge, 180 mm
|Weight||M - 12.45 kg / 27.45 lbs (with TLR sealant, no tubes)|
|Weight limit||This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).|
Sizing & Tech
Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorised retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.
137.0 - 155.0 cm
4'5.9" - 5'1.0"
64.0 - 73.0 cm
25.2" - 28.7"
153.0 - 166.5 cm
5'0.2" - 5'5.6"
72.0 - 79.0 cm
28.3" - 31.1"
161.0 - 172.0 cm
5'3.4" - 5'7.7"
76.0 - 81.0 cm
29.9" - 31.9"
165.5 - 179.0 cm
5'5.2" - 5'10.5"
77.0 - 84.0 cm
30.3" - 33.1"
177.0 - 188.0 cm
5'9.7" - 6'2.0"
83.0 - 88.0 cm
32.7" - 34.6"
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
All measurements provided in cm unless otherwise stated.
|Frame size number||Frame size letter||Geometry position||Wheel size||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|