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It's right for you if...
You're cool with your wheels leaving the ground, but you also like to go the distance on marathon singletrack sessions. You want a bike that lets you crush any trail, and your priority is on the parts.
The tech you get
A lightweight aluminium frame, 140 mm FOX Rhythm 34 fork, and 130 mm of rear travel with an extra-efficient RE:aktiv damper. A SRAM GX Eagle 1x12 drive train with an extra-low 52-tooth climbing gear, plus a Bontrager Line dropper post.
The final word
Fuel EX 8 gives you added efficiency with SRAM's latest, widest-range drive train and Trek's unique RE:aktiv damper that provides firm pedalling support without giving up any plush compliance.
See it in action
favorite_borderWhy you'll love it
- A wider gear range and more efficient suspension help you claw your way up tricky climbs you never thought you'd clean
- If you measure quality in performance per pound, you won't do better than Fuel EX 8
- This bike will make you want to rail every corner, smash every rock garden and charge every descent
- The shifter-style, underbar remote dropper post lever is super intuitive and easy to use
- We expanded our size range to ensure a better fit for all riders. And, you get the fastest wheel that fits your frame: XS frames get 27.5˝ wheels, S frames get to choose between 27.5˝ or 29˝ and sizes M to XL get 29˝ wheels
'A world-class trail bike!'
'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.'
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'Good at pleasing everybody.'
'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.'
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'An absolute trail rocket.'
'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.'
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‘Perfect all-rounder’
‘In a world where most new full-suspension mountain bikes are amazing, Fuel EX stands apart as even more than that.’
Read moreFeatures
Will my bike have a curved top tube?
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.
RE:aktiv technology gives you firm support for efficient pedaling that instantly gives way for smooth control when the trail turns rough.
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.
Suspension Calculator
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
Tubeless Ready rims and tyres make it easy to ditch the tubes so you get better traction, fewer flats and less weight. The rim strips are already installed; just add TLR valves and sealant.
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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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Alpha Platinum Aluminium
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.
Control Freak cable management
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.
Boost148/110
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.
Specifications
*spec applies to all sizes unless otherwise noted
| 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, RE:aktiv 3-position damper, tuned by Trek Suspension Lab, 210x52.5 mm |
|
Size:
S , M , ML , L , XL , XXL Fox Performance Float EVOL, RE:aktiv 3-position damper, tuned by Trek Suspension Lab, 210x55 mm |
| Wheel front | Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru axle |
|---|---|
| Wheel rear | Bontrager Line Comp 30, Tubeless Ready, 6-bolt, 54T Rapid Drive, SRAM XD driver, Boost148, 12 mm thru axle |
| Skewer rear | Bontrager Switch thru axle |
| *Tyre |
Size:
XS , S Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.40" |
|
Size:
XS , S Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.60" |
|
|
Size:
S , M , ML , L , XL , XXL Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewall, 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, 29x2.60" |
|
| Tyre part | Bontrager TLR valve, 50 mm |
| Shifter | SRAM GX Eagle, 12-speed |
|---|---|
| Rear derailleur | SRAM GX Eagle |
| *Crank |
Size:
XS , S SRAM X1 Eagle, DUB, 30T steel ring, Boost, 170 mm length |
|
Size:
M , ML , L , XL , XXL SRAM X1 Eagle, DUB, 30T steel ring, Boost, 175 mm length |
|
| Bottom bracket | SRAM DUB, 92 mm, PressFit |
| Cassette | SRAM Eagle XG-1275, 10-52, 12-speed |
| Chain | SRAM GX Eagle, 12-speed |
| 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 |
|
| *Stem |
Size:
XS , S Bontrager Line, 35 mm, Knock Block, 0-degree, 40 mm length |
|
Size:
M , ML , L , XL , XXL Bontrager Line, 35 mm, Knock Block, 0-degree, 50 mm length |
|
| Head set | Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8" top, 1.5" bottom |
| Brake | SRAM G2 R hydraulic disc |
| *Brake rotor |
Size:
XS , S , M , ML , L , XL , XXL SRAM CenterLine, 6-bolt, round-edge, 180mm |
|
Size:
M , ML , L , XL , XXL SRAM CenterLine, 6-bolt, round-edge, 200 mm |
| Weight | M - 13.78 kg / 30.39 lbs (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 & fit
Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorised Trek retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.
Rider Height
Inseam
XS
137.0 - 155.0 cm
4'5.9" - 5'1.0"
64.0 - 73.0 cm
25.2" - 28.7"
S
153.0 - 166.5 cm
5'0.2" - 5'5.6"
72.0 - 79.0 cm
28.3" - 31.1"
M
161.0 - 172.0 cm
5'3.4" - 5'7.7"
76.0 - 81.0 cm
29.9" - 31.9"
M/L
165.5 - 179.0 cm
5'5.2" - 5'10.5"
77.0 - 84.0 cm
30.3" - 33.1"
L
177.0 - 188.0 cm
5'9.7" - 6'2.0"
83.0 - 88.0 cm
32.7" - 34.6"
XL
186.0 - 196.0 cm
6'1.2" - 6'5.2"
87.0 - 92.0 cm
34.3" - 36.2"
2XL
195.0 - 203.0 cm
6'4.8" - 6'7.9"
92.0 - 95.0 cm
36.2" - 37.4"
All measurements provided in cm unless otherwise stated.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 14.0 | XS | Low | 27.5" | 35.6 | 69.0° | 75.0° | 9.0 | 66.0° | 54.6 | 33.5 | 2.1 | 43.7 | 4.3 | 11.1 | 112.0 | 69.5 | 39.5 | 56.3 |
| 14.0 | XS | High | 27.5" | 35.5 | 69.5° | 75.5° | 9.0 | 66.5° | 54.5 | 34.1 | 1.4 | 43.6 | 4.3 | 10.6 | 111.9 | 70.0 | 40.0 | 55.9 |
| 15.5 | S | High | 27.5" | 39.5 | 69.5° | 75.5° | 10.0 | 66.5° | 56.7 | 34.1 | 1.4 | 43.6 | 4.3 | 10.6 | 114.3 | 70.7 | 42.0 | 56.8 |
| 15.5 | S | Low | 27.5" | 39.5 | 69.0° | 75.0° | 10.0 | 66.0° | 56.8 | 33.5 | 2.1 | 43.7 | 4.3 | 11.1 | 114.4 | 70.0 | 41.5 | 57.2 |
| 15.5 | S | High | 29" | 39.5 | 68.0° | 75.5° | 10.0 | 66.5° | 57.7 | 34.6 | 2.8 | 43.6 | 4.3 | 11.5 | 115.3 | 70.7 | 42.0 | 60.5 |
| 15.5 | S | Low | 29" | 39.5 | 67.5° | 75.0° | 10.0 | 66.0° | 57.8 | 34.0 | 3.4 | 43.7 | 4.3 | 11.9 | 115.4 | 70.1 | 41.5 | 60.9 |
| 17.5 | M | Low | 29" | 42.0 | 67.5° | 75.0° | 10.0 | 66.0° | 60.3 | 34.0 | 3.4 | 43.7 | 4.3 | 11.9 | 117.9 | 74.2 | 44.0 | 60.9 |
| 17.5 | M | High | 29" | 42.0 | 68.0° | 75.5° | 10.0 | 66.5° | 60.2 | 34.6 | 2.8 | 43.6 | 4.3 | 11.6 | 117.8 | 74.8 | 44.5 | 60.5 |
| 18.5 | ML | Low | 29" | 43.5 | 67.5° | 75.0° | 10.5 | 66.0° | 61.9 | 34.0 | 3.4 | 43.7 | 4.3 | 11.9 | 119.6 | 74.5 | 45.5 | 61.3 |
| 18.5 | ML | High | 29" | 43.5 | 68.0° | 75.5° | 10.5 | 66.5° | 61.8 | 34.6 | 2.8 | 43.6 | 4.3 | 11.6 | 119.5 | 75.1 | 46.0 | 60.9 |
| 19.5 | L | Low | 29" | 45.0 | 67.5° | 75.0° | 10.5 | 66.0° | 63.4 | 34.0 | 3.4 | 43.7 | 4.3 | 11.9 | 121.1 | 75.0 | 47.0 | 61.3 |
| 19.5 | L | High | 29" | 45.0 | 68.0° | 75.5° | 10.5 | 66.5° | 63.3 | 34.6 | 2.7 | 43.6 | 4.3 | 11.6 | 121.0 | 75.6 | 47.5 | 60.9 |
| 21.5 | XL | Low | 29" | 50.0 | 67.5° | 75.0° | 12.0 | 66.0° | 66.3 | 34.0 | 3.4 | 43.7 | 4.3 | 11.9 | 124.2 | 76.2 | 49.5 | 62.7 |
| 21.5 | XL | High | 29" | 50.0 | 68.0° | 75.5° | 12.0 | 66.5° | 66.2 | 34.6 | 2.7 | 43.6 | 4.3 | 11.6 | 124.1 | 76.8 | 50.0 | 62.3 |
| 23.0 | XXL | Low | 29" | 54.0 | 67.5° | 75.0° | 14.0 | 66.0° | 68.8 | 34.0 | 3.4 | 43.7 | 4.3 | 11.9 | 127.0 | 80.0 | 51.5 | 64.5 |
| 23.0 | XXL | High | 29" | 54.0 | 68.0° | 75.5° | 14.0 | 66.5° | 68.7 | 34.6 | 2.7 | 43.6 | 4.3 | 11.6 | 126.9 | 80.6 | 52.0 | 64.1 |