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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 aluminum frame, 140mm FOX Rhythm 34 fork, and 130mm of rear travel with an extra-efficient RE:aktiv damper. A SRAM GX Eagle 1x12 drivetrain 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 drivetrain and Trek's unique RE:aktiv damper that provides firm pedaling 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 dollar, 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"
"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 pedaling, and to pump and pop off when you're playing."
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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-arounder"
"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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"Good at pleasing everybody"
"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 at it."
Read moreFeatures
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.
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.
Trek's Straight Shot frame design optimizes 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.
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 setup.
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 in the rear lets you run wider tires and a larger chainring without affecting q-factor and pedaling efficiency.
Tubeless Ready
Tubeless Ready rims and tires 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 Aluminum
Our premium lightweight aluminum is continuously cold extruded and butted at multiple points, and hydroformed into sophisticated tube shapes for maximum strength and minimum weight.
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.
Learn more
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, 15mm Kabolt axle, 140mm 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 | 150mm (561mm axle-to-crown) |
| Wheel front | Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle |
|---|---|
| *Wheel rear |
Size:
XS , S Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 54, 6-bolt, 54T Rapid Drive, SRAM XD driver, Boost148, 12 mm thru axle |
|
Size:
S , M , ML , L , XL , XXL Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Rapid Drive 54, SRAM XD driver, Boost148, 12 mm thru axle |
|
| Hub rear | Bontrager alloy, sealed bearing, 6-bolt, 108T Rapid Drive, SRAM XD driver, Boost148, 12 mm thru axle |
| Skewer rear | Bontrager Switch thru-axle, removable lever |
| *Tire |
Size:
XS , S , M , ML , L , XL , XXL Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 29.x2.40" |
|
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 sidewalls, aramid bead, 120 tpi, 29x2.60" |
|
| *Tire part |
Size:
XS , S , M , ML , L , XL , XXL Bontrager TLR sealant, 180 ml/6 oz |
|
Size:
XS , S , M , ML , L , XL , XXL Bontrager TLR valve, 50mm |
|
| Rim strip | Bontrager TLR |
| Max tire size | Frame: 29x2.60" Fork: See manufacturer |
| 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 |
| Max chainring size | 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, Knock Block, 0-degree, 40 mm length |
|
Size:
M , ML , L , XL , XXL Bontrager Line, 35 mm, Knock Block, 0-degree, 50 mm length |
|
| Headset | 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, 180 mm |
|
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 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.
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 |