Top Fuel 9 Gen 4 - Trek Bikes (CA)

Overview

"The Top Fuel manages to feel quick and efficient without any harshness, a feat that's not easy to accomplish."

"The added ability to futz with not just head/seat angle and bb height, but also play with shock progression AND maybe even long-stroke the bike for more travel is appealing."

"Mind you, it only took a few pedal strokes to appreciate the Top Fuel’s efficient and responsive demeanour.[...]Heading across rockier singletrack, the new bike is noticeably sprightlier and springier than its predecessor."

"I keep finding myself on top of bigger moves than Trek would probably recommend for the Top Fuel, and I keep bouncing out the bottom more in love with the bike."

"...the Top Fuel stands out for being just a touch more composed and forgiving (in terms of its suspension performance) than most of the bikes that it compares most directly to on paper."

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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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Still have questions?

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Save some cash on the light and fast Top Fuel Gen 3, or go even lighter with more adjustability with Top Fuel Gen 4

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Features

Opt for light parts and a 120mm fork for a featherweight Top Fuel, or a 140mm fork and longer-stroke 130mm rear shock for extra versatility. Room for a longer dropper and MX wheels lets you customize Top Fuel into an ultimate playful trail whip.

Easily adjust the suspension and geometry four different ways for where and how you ride. With the flip of a chip, you can ride with more or less progressive suspension, and tweak your geometry for a slacker head tube and lower BB or steeper head tube and higher BB.

New internal frame storage bags make it easy to ditch the pack and still carry your ride essentials.

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.

Learn more

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.

Learn more

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.

Specs

Frame	Alpha Platinum Aluminum, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120mm travel
Fork	Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 130mm travel
Shock	Fox Performance Float DPS, 2-position damper, 185mm x 50mm
Max compatible fork travel	140mm

*Wheel front	Size: S Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 27.5''
Size: M, ML, L, XL Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29''
*Wheel rear	Size: S Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 27.5''
Size: M, ML, L, XL Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12mm thru axle, 29''
Skewer rear	Bontrager Switch thru axle, removable lever
*Tire	Size: S Bontrager Gunnison Pro XR, Tubeless Ready, wire bead, 60 tpi, 27.5x2.40''
Size: M, ML, L, XL Bontrager Gunnison Pro XR, Tubeless Ready, dual compound, aramid bead, 60 tpi, 29x2.40''
Tire part	Bontrager TLR sealant, 180 ml/6 oz
Rim strip	Bontrager TLR
Max tire size	Frame: 29x2.50", Fork: See manufacturer

Battery	SRAM eTap battery pack (with charger)

Shifter	SRAM AXS POD
Rear derailleur	SRAM GX Eagle AXS, T-Type
Crank	SRAM GX Eagle, T-Type, DUB, 30T, 55mm chainline, 170mm length
Bottom bracket	SRAM DUB MTB Wide, 73mm, BSA threaded
Cassette	SRAM Eagle XS-1275, T-Type, 10-52, 12 speed
Chain	SRAM GX Eagle, T-Type, 12 speed
Max chainring size	1x: 34T, min 30T

Saddle	Verse Short Comp, steel rails, 145mm width
*Seatpost	Size: S Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm length
Size: M, ML, L, XL Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 4500mm length
Handlebar	Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width
Grips	Bontrager XR Trail Comp, nylon lock-on
Stem	Bontrager Elite, 35mm, 0 degree, 45mm length
Brake	SRAM Level Bronze 4-piston hydraulic disc
Brake rotor	SRAM CenterLine, 6-bolt, round edge, 180mm
Rotor size	Max brake rotor sizes - Frame: 200mm, min 180mm, Fork: see fork manufacturer

Bag	Bontrager BITS Internal Frame Storage Bag

Weight	M - 14.38 kg / 31.71 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

"More capable & adaptable than ever"

"increased versatility and broader appeal"

"enthusiastic and sporty, offering up impressive pedal efficiency with loads of grip."

"Dear lord, this bike is a hoot"

"light, lively, and efficient"

More options

Service manual

FAQ's

Which Generation?

Make Top Fuel yours

4-way Mino Link

New internal storage with new BITS bags

Active Braking Pivot

You almost forgot your pedals

Suspension Calculator

Complete Tubeless System

Oversized 34.9mm dropper post

ISCG mounts

Threaded bottom bracket

How tall are you?

What is your inseam?

We’ll make this a great experience

Delivered the way you want

30-day Unconditional Guarantee

"More capable & adaptable than ever"

"increased versatility and broader appeal"

"enthusiastic and sporty, offering up impressive pedal efficiency with loads of grip."

"Dear lord, this bike is a hoot"

"light, lively, and efficient"

More options

Service manual

FAQ's

Which Generation?

Product features

Make Top Fuel yours

4-way Mino Link

New internal storage with new BITS bags

Active Braking Pivot

You almost forgot your pedals

Suspension Calculator

Complete Tubeless System

Oversized 34.9mm dropper post

ISCG mounts

Threaded bottom bracket

How tall are you?

What is your inseam?