Top Fuel 8
A 29″ aluminum frame full suspension trail bike with upper mid-range components.
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Manufacturer Price
$3,999Weight | 31.4 lbs |
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Frame | Aluminum |
Suspension | Full, 120 / 120mm |
Fork | RockShox SID |
Shock | RockShox Deluxe Ultimate |
Wheels | 29″ Aluminum |
Drivetrain | 1 × 12 |
Groupset | XT, Deore |
Brakes | Hydraulic Disc |
Seatpost | Dropper |
For This Bike
Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.
Compare the full Top Fuel model range
View Comparison5'1" – 5'6"
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May 2022 · Tom Marvin
An absolute hoot to ride on all but the gnarliest tracks, a true trail bike even if on paper it doesn’t look it
Shrugs off limited travel figures on 95% of trails
Loves to twist and turn
Fast-rolling rubber helps keep speeds high
Fork can twang under heavier riders
You’re occasionally reminded of the 120mm travel
Mar 2022 · Peter Walker
In our big 2022 downcountry group test, we pitted the Trek Top Fuel 9.9 XX1 AXS against 5 of the hottest bikes of the year. Read the full review to find out what it’s capable of and how it stacks up against the competition. Hit the link for the full review and a list with all other bikes in test.
Freedom of movement downhill
Firm and efficient rear suspension generates plenty of traction
Intuitive handling
Practical detail solutions and clean look
Very wide handlebars
Mar 2022 · Guy Kesteven
Trek’s Top Fuel delivers superlative short-travel suspension performance but it’s definitely a trail bike not an XC bike
Infectiously agile and playful vibe
Superlative suspension feel
Seriously tight tracking frame
Trail tough kit
Internal storage
Too heavy for XC racing
Simple fork damper
Tight internal storage access
Yawning gap between this and the Supercaliber
Dec 2021 · Henry Quinney
For a bike that is so capable on the descents, though, the Top Fuel still packs a mighty punch when it comes to gaining elevation..
Great suspension performance
Frame storage
Strong climbing performance
Knockblock isn't as well executed as other brand's versions
Works well when pushing hard, but might not be the most comfortable for all
Oct 2021 · Danny Milner
New Trek Top Fuel 8 is a short travel - 120mm travel front and rear - down-country trail bike with internal frame storage for both alloy and carbon models.
Sublime suspension, playful handling, fantastic size range, internal storage
Not particularly light for the intended use, inconsistent Shimano brakes on our test bike
Oct 2021
The Trek Top Fuel has been overhauled for 2022, receiving an all-new frame with integrated storage, plus key updates to the suspension design and geometry. So how does it ride on the trail? And will everyone be pleased with all the changes? Read on for our Trek Top Fuel review.
Brilliant trail-ripping geometry
Active and supportive suspension
Masses of cornering grip & stability
Refined and practical frame design
Downtube storage is a welcome addition
Dropper post is sluggish
Wheels are solid but quite heavy
Carbon bars are harsh
Heavier than many of its competitors
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 BB Standard: BSA, 73mm, Threaded Tire Clearance: 2.5" Colors: Crimson; Mulsanne Blue |
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Fork | RockShox SID, DebonAir spring, Rush RL damper, lockout, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 120mm travel Travel: 120mm Spring Type: Air |
Shock | RockShox Deluxe Ultimate RCT, 185mm x 50mm Travel: 120mm |
Bottom Bracket | Shimano SM-BB52, 73mm, threaded external bearing |
Headset | Knock Block 2.0 Integrated, 72-degree radius (includes infinite-radius chip), sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom |
Stem | Bontrager Elite, 35mm, 0 degree, 45mm length |
Handlebar | Size: S, Bontrager Line, alloy, 35mm, 27.5mm rise, 750mm width; Size: M, ML, L, XL, XXL, Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width |
Saddle | Bontrager Arvada, steel rails, 138mm width |
Seatpost | Size: S, TranzX JD-YSP39, 100mm travel, internal routing, 34.9mm; Size: M, ML, TranzX JD-YSP39, 150mm travel, internal routing, 34.9mm; Size: L, XL, XXL, TranzX JD-YSP39, 170mm travel, internal routing, 34.9mm Type: Dropper |
Grips | Bontrager XR Trail Comp, nylon lock-on |
Rear Derailleur | Shimano XT M8100, long cage |
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Crank | Size: S, M, ML, L, Shimano Deore M6120, 30T ring, 55mm chainline, 170mm length; Size: XL, XXL, Shimano Deore M6120, 30T ring, 55mm chainline, 175mm length |
Shifters | Shimano XT M8100, 12 speed |
Cassette | Shimano SLX M7100, 10-51T, 12 speed |
Chain | Shimano SLX M7100, 12 speed |
Brakes | Shimano 4-piston hydraulic disc, M6100 lever, M6120 caliper Type: Hydraulic Disc |
Rims | Front: Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29'', Rear: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 29'' |
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Front Hub | Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle |
Rear Hub | Bontrager alloy, sealed bearing, 6-bolt, Rapid Drive 108, Shimano MicroSpline freehub, Boost148, 12 mm thru axle |
Tires | Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 29x2.40'' |
Disc Rotors | Size: S, M, ML, L, XL, XXL, Shimano RT66, 6-bolt, 160mm; Size: S, M, ML, L, XL, XXL, Shimano RT66, 6-bolt, 180mm |
Last updated June 22
Not listed for 13 days