Fuel EX 8 Gen 5 - Trek Bikes (IE)

Overview

'The Fuel EX is a beautifully balanced and capable trail bike. The rear suspension is beautiful; as close to ideal as any bike I've ridden. It's sensitive where you want it to be, firm and crisp where it should be. It feels deep and controls big hits very well, and there's a nice platform for pedalling, and to pump and pop off when you're playing.'

'The Fuel EX has a few tricks that help it keep a level head when outside of its comfort zone, and to be a cloud on rails when it's in the zone. Everything about the Fuel EX, which was already good at pleasing everybody, is now even better.'

'Thanks to its burlier components, increased travel and more aggressive geometry, it has become more of a shredder than ever! More performance, fun and trail prowess.'

‘In a world where most new full-suspension mountain bikes are amazing, Fuel EX stands apart as even more than that.’

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Choose from the lighter 130/140 mm Fuel EX Gen 5 with better parts for the price or the more robust 140/150 mm Fuel EX Gen 6 with more adjustability.

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Time to get 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 PRs and riding with more confidence in no time.

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

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Features

Smaller frames (XS and S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their 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.

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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RE:aktiv technology gives you firm support for efficient pedaling that instantly gives way for smooth control when the trail turns rough.

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Trek's Straight Shot frame design optimises the stiffness-to-weight ratio for a more responsive ride. You'll be able to push harder and stay more planted on your line when the going gets rough.

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This suspension calculator will help you optimise 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 tyres make it easy to ditch the tubes so you get better traction, fewer flats and less weight. You're ready to roll straight out of the box with the included TLR rim strips, valves and sealant.

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Our premium lightweight aluminium is continuously cold extruded and butted at multiple points, and hydroformed into sophisticated tube shapes for maximum strength and minimum weight.

The lightest, quietest, most versatile cable management system allows any combination of shift, brake, lockout and dropper post lines to be routed through the frame for clean looks and the ultimate custom set-up.

Internal routing ports make it easy to add a dropper post upgrade that lets you lower your saddle on the fly so it's out of your way for tricky sections of trail.

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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Wider dropouts (110mm front, 148mm rear) give you the stiffness of a 27.5" wheel with all the benefits of a 29" wheel, and Boost148 at the back lets you run wider tyres and a larger chain ring without affecting q-factor and pedalling efficiency.

Specs

Frame	Alpha Platinum Aluminium, tapered head tube, Knock Block, Control Freak internal routing, downtube guard, ISCG 05, magnesium rocker link, Mino Link, ABP, Boost148, 130 mm travel
Fork	Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44 mm offset, Boost110, 15 mm Kabolt axle, 140 mm travel
*Shock	Size: XS , S Fox Performance Float EVOL, 3-position RE:aktiv damper, tuned by Trek Suspension Lab, 210 mm x 52.5 mm
Size: S , M , ML , L , XL , XXL Fox Performance Float EVOL, 3-position RE:aktiv damper, tuned by Trek Suspension Lab, 210 mm x 55 mm
Max compatible fork travel	150 mm

*Wheel front	Size: XS , S Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 27.5"
Size: S , M , ML , L , XL , XXL Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle, 29"
*Wheel rear	Size: XS , S Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle, 27.5"
Size: S , M , ML , L , XL , XXL Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Shimano MicroSpline freehub, Boost148, 12 mm thru axle, 29"
Size: S , M , ML , L , XL , XXL Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle, 29"
Hub front	Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle
Hub rear	Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano MicroSpline freehub, Boost148, 12 mm thru axle
Skewer rear	Bontrager Switch thru-axle, removable lever
Rim	Bontrager Line Comp 30, Tubeless-Ready
Spokes	14 g stainless steel, black
*Tyre	Size: XS , S Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5 x 2.40''
Size: XS , S Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5 x 2.60"
Size: XS , S Bontrager XR5 Team Issue, Tubeless Ready, Inner Strength casing, aramid bead, 60 tpi, 27.5 x 2.50"
Size: S , M , ML , L , XL , XXL Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 29x2.40"
Size: S , M , ML , L , XL , XXL Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 29 x 2.60"
Size: S , M , ML , L , XL , XXL Bontrager XR5 Team Issue, Tubeless Ready, Inner Strength casing, aramid bead, 60 tpi, 29x2.50"
Tyre part	Bontrager TLR sealant, 180 ml/6 oz
Max tyre size	Frame: 29x2.60", Fork: See manufacturer

Shifter	Shimano XT M8100, 12-speed
Rear derailleur	Shimano XT M8100, long cage
Bottom bracket	Shimano MT500, 92 mm, PressFit
Cassette	Shimano XT M8100, 10-51, 12-speed
Chain	Shimano SLX M7100, 12-speed
Max. chainring size	1x: 34T

Saddle	Bontrager Arvada, hollow chromoly rails, 138 mm width
*Seatpost	Size: XS , S Bontrager Line Dropper, 100 mm travel, internal routing, 31.6 mm, 345 mm length
Size: M , ML , L , XL , XXL Bontrager Line Dropper, 150mm travel, internal routing, 31.6 mm, 440mm length
*Handlebar	Size: XS , S Bontrager Line, alloy, 35 mm, 27.5 mm rise, 750 mm width
Size: M , ML , L , XL , XXL Bontrager Line, alloy, 35 mm, 27.5 mm rise, 780 mm width
Grips	Bontrager XR Trail Elite, nylon lock-on
*Stem	Size: XS , S Bontrager Line, 35 mm, 0-degree, 40 mm length
Size: XS , S Bontrager Elite, 35 mm, 0-degree, 35 mm length
Size: M , ML , L , XL , XXL Bontrager Line, 35 mm, 0-degree, 50 mm length
Size: M , ML , L , XL , XXL Bontrager Elite, 35 mm, 0-degree, 45 mm length
*Brake	Size: XS , S , M , ML , L , XL , XXL Shimano 4-piston hydraulic disc, MT4100 lever, MT420 calliper
Size: XS , S , M , ML , L , XL , XXL SRAM DB 8 4-piston hydraulic disc
*Brake rotor	Size: XS , S , M , ML , L , XL , XXL Shimano RT66, 6-bolt, 180 mm
Size: XS , S , M , ML , L , XL , XXL SRAM CentreLine, 6-bolt, round-edge, 180 mm
Size: M , ML , L , XL , XXL Shimano RT66, 6-bolt, 203 mm
Size: M , ML , L , XL , XXL SRAM CentreLine, 6-bolt, round-edge, 200 mm

Weight	M - 13.86 kg/30.56 lb (with TLR sealant, no tubes)
Weight limit	This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Sizing

How tall are you?

To measure your height, stand up straight, 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 inside leg?

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 inside leg measurement. Your inside leg is very important to your final bike size so please measure carefully.

Geometry

Service

Reviews

We'll take care of you. Period.

Warrantied for life

We're where you are!

'A world-class trail bike!'

'Good at pleasing everybody.'

'An absolute trail rocket.'

‘Perfect all-rounder’

More options

Which generation is right for you?

Service manual

Get faster on the trail in a week

How to pack for any trail ride

Will my bike have a curved top tube?

Active Braking Pivot

RE:aktiv

Straight Shot w/Knock Block

Suspension Calculator

Complete Tubeless System

Alpha Platinum Aluminium

Control Freak cable management

Internal dropper compatible

Mino Link adjustable geometry

Boost148/110

How tall are you?

What is your inside leg?

We'll take care of you. Period.

Warrantied for life

We're where you are!

'A world-class trail bike!'

'Good at pleasing everybody.'

'An absolute trail rocket.'

‘Perfect all-rounder’

More options

Which generation is right for you?

Service manual

Get faster on the trail in a week

How to pack for any trail ride

Product features

Will my bike have a curved top tube?

Active Braking Pivot

RE:aktiv

Straight Shot w/Knock Block

Suspension Calculator

Complete Tubeless System

Alpha Platinum Aluminium

Control Freak cable management

Internal dropper compatible

Mino Link adjustable geometry

Boost148/110

How tall are you?

What is your inside leg?