A new breed of mountain bike
First there was the forest. Next came the trail. And then there were mountain bikes. Hardtails for hammering. Full suspensions for crushing. Short travel whips. Long travel steeds. High powered e-bikes. Now—there’s Fuel EXe. Evolved to break the mold, bridge the gap, and elevate your ride with quiet assist that all but disappears in the woods. Fuel EXe is the culmination of your every desire on singletrack. It’s an e-mountain bike that empowers you to do more, without interrupting the way you experience nature. Just as a mountain bike should. It’s your best trail ride ever, with extra Fuel in the tank.
DOWN TO EARTH
OUT OF THIS WORLD
Natural look. Natural ride. Surprisingly electric.
Tonality units - barely perceivable
Up to 20 mph
2-5 hrs / 360Wh
3-7.5 hrs with 160Wh extender
Hiding in plain sight
Sometimes the beauty isn’t in what we see, but what we don’t. Nestled neatly behind the front chainring, the naturally advanced harmonic pin ring transmission blends in effortlessly. Its petite package allows for a 39% smaller down-tube than a traditional e-MTB, resulting in a ride that fits right in with traditional mountain bikes on the trail.
Tiny but mighty
Desipite being smaller than your chainring, the drive unit hits with 50Nm of toque.
Good sounds. Bad sounds.
Less is more
When we’re on the trail and connecting with nature, we don’t want to hear more than the sound of our tires on the dirt, the wind through the trees, and the hoots and hollers of our riding crew. Up until now, e-bikes have pulled us away from that experience with high-pitched motors that take us out of the element. Fuel EXe is different. It’s not only quieter—it’s less annoying.
Tonality (sound perception)
When it comes to sound, decibels don’t tell the whole story. Sounds like a ripping current of a river or wind rustling through trees might measure in as quite loud, but they don’t distract us from the ride. That has everything to do with something called tonality.
Simply put, tonality is the measurement of how annoying and perceivable a sound is. It’s the difference between the crunch of leaves under your tire, and a squeaking brake rotor.
Cadence and tonality
Tonality is measured in tonality units, or tu for short. Sounds that measure under 0.1tu aren’t perceivable to the human ear, while sounds over 0.4tu are grating and annoying.
Fuel EXe’s motor is tuned for tone, measuring in under 0.2tu—five times less perceivable than other light-assist bikes—so you can forgo the annoying whine of most e-bike motors to stay in the moment and connected with nature while you ride.
Data recorded in an anechoic chamber using a calibrated B&K 4966-h-041 microphone and Siemens SCADAS data acquisition unit with an acoustically-isolated Wahoo Kickr trainer set to 300W total resistance and bikes in maximum assist mode. Microphone was located 1 m laterally from the bottom bracket and 1.7 m off the floor (head height) and sampled at 51,200 Hz. Tonality calculated in Siemens Testlab Neo according to the ECMA-74:2019 standard.
While some e-bikes feel cumbersome and bulky, Fuel EXe is light, nimble, and playful, just as a trail bike should be. Its capable geometry is finetuned for barreling into berms and making light work of tech trails, lacing turns through tight aspens, and gnawing through rowdy rock gardens. Instead of being flung uphill like a rocket launcher, Fuel EXe’s assist feels natural, barely there — like an extension of your own power, so you can ride just like you would on a traditional mountain bike.
Built like a trail bike. Rips like a trail bike.
Fuel EXe is built with trail bike geometry that’s slack and capable out front with a 65-degree head tube angle.
A 77-degree seat tube angle keeps you perched for punchy climbs and long pedal fests up fire roads.
With a compact motor, Fuel EXe’s chainstays are able to stay tight at just 440mm, keeping the ride nimble and playful.
Dialed for how you ride
Mino Link lets you quickly and easily tweak your geometry, so your bike is always tuned perfectly for the terrain and your riding style. .
With 50Nm of torque, Fuel EXe has just the right amount of force for cranking up steep climbs without launching you forward with jerky propulsion. It finds the sweet spot between too much and too little for a ride that’s natural and smooth, but not overwhelmed.
There s nothing like it
The harmonic pin ring transmission
Most e-bike motors use gears and belts to move you forward— but belts and gears lash, slip, rattle, and wear out over time. That disconnects you from the ride. Fuel EXe uses a motor unlike anything else out there—the TQ harmonic pin ring transmission. The harmonic pin ring transmission is not only smaller and lighter than traditional e-bike motors, but because it has fewer moving parts it’s also smoother, quieter, and more durable. It delivers more of the ride experience without any downside.
The integrated display sits flush with your top tube and tucked completely out of the way. Easily see the details you need when you want to, and let them disappear when the trail is all that matters.
An intuitive and discrete handlebar remote allows you to toggle between modes without your hand leaving the safety of your grip.
Packing in a whopping 360Wh, the battery offers plenty of power for big rides. It’s stowed away efficiently to take up less space in the down tube than traditional e-bike batteries and is simple to remove with a hex wrench.
Boost your ride
Hammer out big mile days with Range Extender. This compact bottle-shaped back up battery offers 160Wh of power that extends the distance you can ride by 44%. It tucks neatly in your existing bottle cage for simple connection to the charge port, which is located high on the down tube to stay clear from mud and make charging up simple. No additional hardware swapping needed. Just toss it in the existing cage, plug in, and go.
Everything in the palm of your hand
Tuned to you
You’re in control with three completely adjustable motor tune settings that can be easily tweaked on the fly. Quickly adapt your Fuel EXe to your terrain or riding style from the Trek Central app.
Plan your ride
Map out the perfect ride with easy-to-use maps and let the app show you how far you’ll make it with your current battery level.
See your stats
Keep track of the hours you spend in the saddle, the distance you ride, battery usage, and calories burned with activity tracking.
Scroll through a complete history of your rides and work towards new goals with ride history that logs every ride automatically when your Fuel EXe is paired to the Trek Central app.
Plays well with others
Pair your Trek Central app with Strava and Komoot to seamlessly communicate ride details and automatically log your rides across different apps.