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Trek Top Fuel 8 XT

Trek Top Fuel 8 XT
  • Color: Crimson
  • Color: Mulsanne Blue
Color: Mulsanne Blue
Size: Medium/Large
Please select options Unavailable
In Store / Curbside Pickup Only. Bike Orders are typically ready in 2 – 5 days*. *Bikes may need to be built or transferred from another location. This may add extra processing time.


Top Fuel is a quick short-travel 29er trail bike that’s perfect for riders who like to stay pinned both up and down the trail.

It’s lighter and snappier than a trail bike, but it’s a lot more forgiving on rowdy descents than a true cross-country bike. It’s the best of both worlds, and a hell of a lot of fun in the dirt.

The Top Fuel features a lightweight Platinum Aluminum frame, 120mm RockShox SID fork with plush DebonAir spring, 120mm of rear travel with a FOX Performance Float shock, and a Shimano Deore XT drivetrain. Plus, 4-piston brakes make for confident descents.

Top Fuel 8 earned high praise from Bike Radar MBUK for its updated geometry, a build that's up for anything, and suspension that feels deeper than the sum of its numbers when the trail gets rowdy.

It also earned top honors in Enduro Mounatin Bike Magazine's roundup of best downcountry bikes, thanks to the Top Fuel's clean look, practical details, and progressive suspension.

Top Fuel has evolved from its XC racing roots. Now, it’s a blazing fast downcountry trail bike that’s seriously fun in the rough.

Loves to pedal up

Leaps forward thanks to a light frame and pedal-friendly suspension kinematics

Lives for challenging descents

Built with longer, slacker geometry and trail bike suspension and spec.

Rip down and rocket up any trail with Top Fuel’s capable and efficient suspension. 120mm of travel front and rear gives you enough squish to take bigger hits while a low leverage rate and high anti-squat ensure this bike jumps forward with every pedal stroke.

Optimized anti-squat = Snappy pedaling support

Top Fuel's efficient pedaling comes from a forward pivot on the seattube that provides optimal, near-constant anti-squat through the entire travel. So regardless of where you are in the travel, the bike accelerates when you push on the pedals.

All Top Fuel models—both alloy and carbon—have in-frame storage for tools and gear. Plus, Bontrager’s BITS tool bag fits right inside.


Frame Alpha Platinum Aluminum, internal storage, tapered head tube, Knock Block 2.0, internal guided routing, downtube guard, magnesium rocker link, Mino Link, ABP, Boost148, 120mm travel
Fork RockShox SID, DebonAir spring, Rush RL damper, lockout, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 120mm travel
Rear Shock RockShox Deluxe Ulitmate RCT, 185mm x 50mm
Wheels Front: Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle
Rear: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 54, 6-bolt, Boost148, 12mm thru axle
Tires Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 29 x 2.40"
Bottom Bracket Shimano SM-BB52, 73mm, threaded external bearing
Crankset Shimano Deore M6120, 30T ring, 55mm chainline
Shifters Shimano XT M8100, 12 speed
Rear Derailleur Shimano XT M8100, long cage, 51T max cog
Cassette/Freewheel Shimano SLX M7100, 10-51, 12 speed
Chain Shimano SLX M7100, 12 speed
Brakes Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper
Rotors Shimano RT66, 6-bolt
Handlebars Bontrager Line, alloy, 35mm, 27.5mm rise
Tape/Grips Bontrager XR Trail Comp, nylon lock-on
Stem Bontrager Elite, 35mm, 0 degree, 45mm length
Headset Knock Block 2.0 Integrated, 72-degree radius (includes infinite-radius chip), sealed cartridge bearing, 1-1/8" top, 1.5" bottom
Seatpost TranzX JD-YSI-22PLQ, internal routing, 34.9mm
Saddle Bontrager Arvada, steel rails, 138mm width
Pedals Sold separately
Accessories & Extras Bontrager BITS Internal Frame Storage Bag

* Subject to change without notice.

Part Numbers

Option UPC MPN Store SKU
Mulsanne Blue / Medium/Large 601842583203 5259801 BIK453910232