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It's right for you if...
You want to build up one single full suspension bike that's super fun to ride on a wide variety of trails. You're looking for a frame that's designed for both efficiency and shred-ability.
The tech you get
A lightweight Alpha Platinum Aluminum frame internal storage, Mino Link adjustable geometry, a 120mm Fox Performance Float shock with 2-position DPS damper, Knock Block 2.0 headset, 35mm Bontrager Elite stem, and internal cable routing. Designed for a 120mm fork, but can handle up to 130mm of fork travel. Fits 2.4" tires.
The final word
If you want a high-value foundation for a full suspension bike that's fast and fun on both flow trails and technical descents, Top Fuel AL is the place to start.
The Walkthrough
favorite_borderWhy you'll love it
- Alpha Platinum Aluminum is lightweight and trail-tough
- Efficient and capable: you can build up this frameset to suit a wide range of trails and terrain
- Mino Link lets you make small adjustments to your geometry quickly and easily, even mid-ride
- A sleek internal storage compartment gives you a versatile spot to stow tools and gear
- New, removable Knock Block has a bigger steering angle to keep cables and hoses safe without sacrificing turning radius
MBUK’s Trail Bike of the Year 2022
“It’s easy to look at the bike from afar and assume this is just another downcountry rig... It wasn’t until I’d fired it over some jumps, nosed it down the odd steep chute and slung it through my test loops’ berms that I realised the Top Fuel is, simply put, a bloody brilliant trail bike.”
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"Enduro’s Best Downcountry Bike of 2022"
"Top Fuel 9.9 XX1 AXS earned top honors in Enduro’s round-up of best downcountry rippers, thanks to the bike’s clean look, practical details, and progressive suspension."
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"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."
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"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 40mm. 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."
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Features
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.
Quick and in control
120mm 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.
Knock Block has your frame's back when things go wrong. It prevents your handlebars from spinning all the way around in a crash, so your hoses won't get yanked, and your controls won't hit the top tube.
Internal frame storage makes it easy to ditch the pack and still carry your ride essentials.
Guided internal cable routing keeps Top Fuel quiet on the trail and maintenance a breeze.
Will my bike have a curved top tube?
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. 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.
Suspension Calculator
This suspension calculator will help you optimize your suspension settings for your riding weight. Simply follow the steps to find your best set up.
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Threaded bottom bracket
More robust than pressfit, threaded BBs hold up in nasty conditions and make servicing easier.
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.
ISCG mounts
International Standard Chain Guide mounts offer easy chain guide installation and adjustment.
Mino Link adjustable geometry
Fine tune head tube angle by 1/2° and BB height by up to 10mm with the simple turn of a nut. Just flip the link to choose between slack or slacker geometry, without negatively affecting suspension performance. A Trek exclusive.
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Knock Block
Knock Block has your frame's back when things go wrong. It prevents your handlebars from spinning all the way around in a crash, so your hoses won't get yanked, and your controls won't hit the top tube.
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Specifications
*spec applies to all sizes unless otherwise noted
| 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 |
|---|---|
| Shock | Fox Performance Float DPS, 3-position damper, 185mm x 50mm |
| Max compatible fork travel | 130mm (541mm axle-to-crown) |
| Skewer rear | Bontrager Switch thru axle, removable lever |
|---|---|
| Max tire size | Frame: 29x2.5" |
| Max chainring size | Max: 36T (oval - 34T) Min: 28T |
|---|
| 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 |
| Rotor size | Max brake rotor size: 180mm rear |
| Bag | Bontrager BITS Internal Frame Storage Bag |
|---|
| Weight | M - 3.74 kg / 8.25 lbs |
|---|---|
| Weight limit | This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg). |
Sizing & Tech
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 retailer.
All measurements provided in cm unless otherwise noted.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15.5" | S | High | 29" | 39.5 | 70.4° | 76.4° | 10 | 66.4° | 56.7 | 34.3 | 3.1 | 43.4 | 4.4 | 11.5 | 115 | 71.9 | 42.4 | 59.2 |
| 15.5" | S | Low | 29" | 39.5 | 70.0° | 76.0° | 10 | 66.0° | 56.8 | 33.8 | 3.6 | 43.5 | 4.4 | 11.8 | 115.1 | 71.5 | 42 | 59.5 |
| 17.5" | M | High | 29" | 42 | 70.4° | 76.4° | 10 | 66.4° | 59.7 | 34.3 | 3.1 | 43.4 | 4.4 | 11.5 | 118 | 74 | 45.4 | 59.2 |
| 17.5" | M | Low | 29" | 42 | 70.0° | 76.0° | 10 | 66.0° | 59.8 | 33.8 | 3.6 | 43.5 | 4.4 | 11.8 | 118.1 | 73.5 | 45 | 59.5 |
| 18.5" | ML | High | 29" | 43.5 | 70.4° | 76.4° | 10.5 | 66.4° | 61.4 | 34.3 | 3.1 | 43.4 | 4.4 | 11.5 | 119.7 | 74.5 | 46.9 | 59.7 |
| 18.5" | ML | Low | 29" | 43.5 | 70.0° | 76.0° | 10.5 | 66.0° | 61.5 | 33.8 | 3.6 | 43.5 | 4.4 | 11.8 | 119.8 | 74 | 46.5 | 60 |
| 19.5" | L | High | 29" | 45 | 70.4° | 76.4° | 11 | 66.4° | 63 | 34.3 | 3.1 | 43.4 | 4.4 | 11.5 | 121.4 | 75 | 48.4 | 60.1 |
| 19.5" | L | Low | 29" | 45 | 70.0° | 76.0° | 11 | 66.0° | 63.1 | 33.8 | 3.6 | 43.5 | 4.4 | 11.8 | 121.5 | 74.5 | 48 | 60.5 |
| 21.5" | XL | High | 29" | 50 | 70.4° | 76.4° | 12.5 | 66.4° | 65.3 | 34.3 | 3.1 | 43.4 | 4.4 | 11.5 | 124 | 76 | 50.4 | 61.5 |
| 21.5" | XL | Low | 29" | 50 | 70.0° | 76.0° | 12.5 | 66.0° | 65.4 | 33.8 | 3.6 | 43.5 | 4.4 | 11.8 | 124.1 | 75.5 | 50 | 61.8 |
| 23.0" | XXL | High | 29" | 54 | 70.4° | 76.4° | 13.5 | 66.4° | 67.5 | 34.3 | 3 | 43.4 | 4.4 | 11.5 | 126.5 | 77 | 52.4 | 62.4 |
| 23.0" | XXL | Low | 29" | 54 | 70.0° | 76.0° | 13.5 | 66.0° | 67.6 | 33.8 | 3.6 | 43.5 | 4.4 | 11.8 | 126.5 | 76.5 | 52 | 62.7 |