Top Fuel 9.8 GX AXS Gen 3 - Trek Bikes (CA)

Overview

“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.”

"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."

"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."

"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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Still have questions?

Get answers

Time to bust out the repair stand for some maintenance? Find a detailed breakdown of your bike with part numbers, torque values, and platform-specific tech instructions below.

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When it comes to being a better trail rider, practice makes perfect. Get seven tips from Pinkbike’s Christina Chappetta that will have you setting PR's and riding with more confidence in no time.

Everything you need (and nothing you don’t).

Learn how

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.

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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.

Internal frame storage makes it easy to ditch the pack and still carry your ride essentials.

Watch the video

Guided internal cable routing keeps Top Fuel quiet on the trail and maintenance a breeze.

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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.

This bike doesn’t come with pedals because you'll have a better ride if you choose your own. Explore the pedal guide to find the best pedals for your riding style. Reach for flat pedals for simple versatility or go for clipless MTB pedals if you want control & efficiency.

See the guide

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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Tubeless Ready rims and tires make it easy to ditch the tubes so you get better traction, fewer flats, and less weight. You're ready to roll right out of the box with the included TLR rim strips, valves, and sealant.

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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.

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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.

International Standard Chain Guide mounts offer easy chain guide installation and adjustment.

More robust than pressfit, threaded BBs hold up in nasty conditions and make servicing easier.

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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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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Enjoy precise, lightning fast gear changes—even when shifting under load—with Eagle AXS wireless electronic drivetrains. They're water- and dust-proof, and the AXS App makes it easy to personalize your settings.

Specs

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, 120mm travel
Fork	RockShox Pike Select+, DebonAir spring, Charger 3 RC2 damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 130mm travel
Shock	RockShox Deluxe Ultimate RCT, 185mm x 50mm
Max compatible fork travel	130mm (541mm axle-to-crown)

*Wheel front	Size: XS Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 27.5''
Size: S, M, ML, L, XL Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29''
*Wheel rear	Size: XS Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost148, 12mm thru axle, 27.5''
Size: S, M, ML, L, XL Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost148, 12mm thru axle, 29''
Hub front	Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle
Skewer rear	Bontrager Switch thru axle, removable lever
Rim	Bontrager Line Elite 30, Tubeless Ready
*Tire	Size: XS Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 27.5x2.40''
Size: S, M, ML, L, XL Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 29x2.40"
Tire part	Bontrager TLR sealant, 180 ml/6 oz
Rim strip	Bontrager TLR
Max tire size	Frame: 29x2.50", Fork: See manufacturer

Shifter	SRAM GX Eagle AXS, 12 speed
Rear derailleur	SRAM GX Eagle AXS
*Crank	Size: XS, S, M, ML, L SRAM GX Eagle, DUB MTB Wide, 30T, Boost (55 mm chainline), 170 length
Size: XL SRAM GX Eagle, DUB MTB Wide, 30T, Boost (55 mm chainline), 175 length
Bottom bracket	SRAM DUB MTB Wide, 73mm, BSA threaded
Cassette	SRAM Eagle XG-1275, 10-52, 12 speed
Chain	SRAM GX Eagle, 12 speed
Max chainring size	1x: 36T round, 34T oval, min 28T

Saddle	Bontrager Arvada, austenite rails, 138mm width
*Seatpost	Size: XS, S Bontrager Line Elite Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 345mm length
Size: M, ML Bontrager Line Elite Dropper, 150mm travel, MaxFlow, internal routing, 34.9mm, 440mm length
Size: L Bontrager Line Elite Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 485mm length
Size: XL Bontrager Line Elite Dropper, 200mm travel, MaxFlow, internal routing, 34.9mm, 550mm length
*Handlebar	Size: XS, S Bontrager Line Pro, OCLV Carbon, 35mm, 15mm rise, 750mm width
Size: M, ML, L, XL Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
Grips	Bontrager XR Trail Elite, nylon lock-on
Stem	Bontrager Line Pro, 35mm, Blendr compatible, 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
Brake	SRAM G2 RS hydraulic disc
*Brake rotor	Size: XS, S, M, ML, L, XL SRAM CenterLine, 6-bolt, round edge, 160mm
Size: XS, S, M, ML, L, XL SRAM CenterLine, 6-bolt, round edge, 180mm
Rotor size	Max brake rotor sizes - Frame: 180mm, Fork: see fork manufacturer

Weight	M - 13.28 kg / 29.28 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).

Sizing

How tall are you?

To measure your height, stand straight up, barefoot, with your back, heels, shoulders and head all touching a wall. While looking straight ahead, place a book or straight edge on your head and slowly push it against the wall. Your straight edge should be parallel with the floor. Mark the spot where the bottom of the book is touching the wall. The distance from the marked spot to the floor is your height.

What is your inseam?

How to measure: Stand barefoot with your back straight and against a wall. Tuck a ruler or something that extends to the floor between your legs. Using both hands, and keeping it level, pull the ruler up into your crotch as if you were sitting on the saddle. Measure the distance from the top edge of the ruler to the ground to find your inseam measurement. Your inseam is very important to your final bike size so please measure carefully.

Geometry

Service

Reviews

We’ll make this a great experience

Delivered the way you want

30-day Unconditional Guarantee

MBUK’s Trail Bike of the Year 2022

"Enduro’s Best Downcountry Bike of 2022"

"This is a really, really good bike"

"This thing rips"

More options

FAQ's

Service manual

Get faster on the trail in a week

How to pack for any trail ride

Active Braking Pivot

Quick and in control

Internal Storage

Hassle-free routing

Will my bike have a curved top tube?

You almost forgot your pedals

Suspension Calculator

Complete Tubeless System

Carbon Care Wheel Loyalty Programme

Oversized 34.9mm dropper post

ISCG mounts

Threaded bottom bracket

Knock Block

Mino Link adjustable geometry

SRAM Eagle AXS drivetrain

How tall are you?

What is your inseam?

We’ll make this a great experience

Delivered the way you want

30-day Unconditional Guarantee

MBUK’s Trail Bike of the Year 2022

"Enduro’s Best Downcountry Bike of 2022"

"This is a really, really good bike"

"This thing rips"

More options

FAQ's

Service manual

Get faster on the trail in a week

How to pack for any trail ride

Product features

Active Braking Pivot

Quick and in control

Internal Storage

Hassle-free routing

Will my bike have a curved top tube?

You almost forgot your pedals

Suspension Calculator

Complete Tubeless System

Carbon Care Wheel Loyalty Programme

Oversized 34.9mm dropper post

ISCG mounts

Threaded bottom bracket

Knock Block

Mino Link adjustable geometry

SRAM Eagle AXS drivetrain

How tall are you?

What is your inseam?