Can an e-bike really handle a century? After 103 miles, I finally had an answer

A century can ask a lot of questions.

Ride 100 miles and most of the things you thought were fine eventually get audited: your fitness, your position, your tire choice, your fueling, your patience, your ability to make reasonable decisions after five hours of drinking sugar water and staring at someone else’s rear wheel.

On an e-bike, there is one more thing to worry about.

The battery.

That was the question I had going into the 2026 Trek 100: Does an e-bike actually have enough range for a century? Not a casual coffee-shop century. Not a slow noodle with a tailwind and unlimited pastry stops. A real event century. Fast groups, rolling roads, aid stations, a rising afternoon wind, and enough pace that nobody was going to mistake the ride for a recovery day.

I had a bike with a 28 mph assist cutoff, TQ’s new HPR40 drive unit, a 580Wh in-frame battery, and two 160Wh range extenders. In total, I had 900Wh of battery available, which felt like a lot when I rolled out.

It also felt like maybe not enough, because range anxiety is real.

By the end of the ride, I had answers. Not universal answers—one ride, one rider, one bike, one route, one day of weather—but better answers than a brand range claim because they came from 103 miles of actual road. I learned how much battery I really used, whether I still got a legitimate workout, how much the 28 mph cutoff mattered, why wind makes range math ugly, and why carrying more battery can mean carrying less water.

The short answer is yes: A modern e-bike can have enough range for a century.

The useful answer is more complicated.

The Details of My First E-Bike Century

I’ve ridden many centuries and gran fondos, but I’d never done one on an e-bike. When an entry to the 2026 Trek 100 presented itself, and my available bike choices included an e-bike, I decided to try 100 miles with electric assist.

Because the bike I rode is under embargo until September, I can’t get into many specifics. I can say it was a Class 3 bike, with assist up to 28 mph, and TQ’s new HPR40 drive unit. TQ claims a maximum of 40 Nm of torque and up to 200 watts of assist from this system.

I rode the entire event in TQ’s Eco mode, though not quite in its stock form. Before the ride, I bumped Eco’s maximum assist from 100 watts to 125 watts. Not a huge change, but enough to matter over 100 miles.

When the bike goes on sale, it will be offered with either a lighter 360Wh in-frame battery or TQ’s larger 580Wh battery. My bike had the 580Wh battery. I also had TQ’s 160Wh range extender available. With TQ’s system, the bike draws from the range extender first, then switches to the main battery once the extender is depleted.

I did not just FAFO and launch into this century hoping the bike had enough range. Before the Trek 100, I did a shorter group test ride on similar terrain with the bike in factory-set Eco, its lowest assist mode. That ride was 24.3 miles with 1,100 feet of climbing and consumed 21 percent of the main battery. With the 580Wh battery, that worked out to roughly 122Wh used, or about 5Wh per mile.

That gave me confidence that the 100-mile route was well within reach with help from one of TQ’s range extenders. It also gave me a useful baseline. The Trek 100 would be faster, longer, and windier than my test loop, plus I saw that I had enough battery to tune Eco mode for slightly more assist. So, yes, I expected the final burn rate to be higher. But the test ride told me I was not asking the bike to do something absurd.

During the event, I did spend some time sitting in groups, which, due to the draft, reduced battery consumption. But I spent most of the ride either solo or on the front. Unsurprisingly, when other riders discover you’re on an e-bike, they, er, encourage you to go to the front and pull.

Can You Ride a Century on an E-Bike?

I did, and I finished with 42 percent battery remaining. But there are caveats.

The route was a huge part of the success. The 2026 Trek 100 was run on a 33-mile loop with 1,190 feet of elevation gain per lap. A little more than 3,500 feet of climbing over 100 miles isn’t nothing, but it is pretty friendly terrain for an e-bike century. There were two aid stations: one at mile 20 and another at the start/finish.

Although my test loop made me believe I could ride the full 100 miles with just one range extender, Trek provided me with a second just to ensure I could finish. The loop layout let me stash a second range extender at the start/finish. I burned through the first range extender partway through lap one, swapped in the second at the start of lap two, and removed it before lap three. As it turned out, I would have been fine with just one extender, just as the test loop had indicated.

Here’s the battery math. I had the 580Wh main battery plus two 160Wh range extenders, for 900Wh total. I finished with 42 percent remaining in the main battery. Assuming both range extenders were fully depleted, I used 656.4Wh. That means I could have completed the century with the 580Wh main battery plus one 160Wh extender—740Wh total—and still had a little battery left. My consumption was no worse than about 6.4Wh per mile, or about 0.16 miles per watt-hour.

That number is useful, but only if you respect its limitations. It belongs to this ride: this route, this bike, this assist setting, this rider, this weather, and this amount of group riding. Change the climbing, wind, speed, tire choice, rider weight, or how much time you spend on the front, and the number changes.

Aerodynamics mattered, too. The bike I rode did not have much aero shaping or an aero handlebar. It had shallow-ish 37mm wheels and fast-rolling 32mm tubeless tires. I wore snug-fitting (but not explicitly aero) clothing, an aero helmet, lace-up shoes with lace covers, and aero socks. Most of the time I rode on the hoods, but I tried to keep my elbows bent and my head low.

I’m mentioning this because aero matters to battery consumption for the same reason it matters to speed on an unassisted road bike. Every watt you save pushing air is a watt you, or the motor, do not need to supply. If this were my e-bike and I wanted to maximize range, I’d strongly consider deeper wheels.

My lap times were consistent:

Lap 1: 1:27:32, with no stop at the mile-20 aid station

Lap 2: 1:27:34, with no stop at the mile-20 aid station

Lap 3: 1:29:56, with a stop at the mile-20 aid station and a stronger headwind

That third lap is important. It was slower, but not easier. The wind picked up in the afternoon, and one section of the course had a stout block headwind. That is where e-bike range math gets muddied. You can plan around a distance and elevation gain. Wind is a more ephemeral variable.

My bike’s 28 mph assist cutoff also mattered. For a fast century or gran fondo, the cutoff can determine whether the motor helps only on slower climbs and rollers, or whether it also supports the sustained fast work that defines a hard ride. The groups I rode with were all moving above 20 mph on all but the longer, steeper climbs, which were few on this route. Because this bike provided assist up to 28 mph, it helped me ride up to those groups and stay with them. If this had been a Class 1 bike with a 20 mph cutoff, I would not have ridden the century as fast, and the group dynamics would have been different.

Did I Get a Workout?

Many riders who have never done a real ride on an e-bike seem to think electric assist removes the fitness component from cycling. Like the bike shuttles you around while you contribute roughly the same effort required to watch the Tour from the couch.

That is not how this went.

You can pedal as hard as you want on an e-bike, same as on an unassisted bike. The motor changes the ride, but it does not erase your legs, lungs, heart rate, bad decisions, or need for snacks. And thanks to power meters and heart rate monitors, this century gave me something better than vibes.

For the 100-plus miles, Strava credited me with 4 hours, 31 minutes, and 19 seconds of moving time, which works out to 22.8 mph. That is a decently fast 100 miles. It is also faster than I would have ridden this course without assist.

My rider-side power—not including the e-bike’s assist—was 208 watts normalized power. I racked up 353 TSS, 2,874 kJ of work, and an estimated 3,270 calories burned. My average heart rate was 149 bpm, and I hit 173 bpm max.

CoachCat, the AI coaching app I use, called it “substantial training stress.” It also flagged 11 new power PRs from five seconds out to three hours and suggested bumping my FTP by three watts.

So, yes, I got a workout.

Was it the same workout I would have gotten on an unassisted road bike? No. Of course not. The motor helped. I had Eco tuned to provide up to 125 watts of assist, and there were plenty of moments—rollers, accelerations, headwind sections, and the late miles—where I was happy it was there.

But that help did not make the ride fake. It let me spend more time moving fast and less time bleeding speed.

Based on rough modeling from my rider-side power and battery use, my best estimate is that the same 103-mile ride on an unassisted road bike, at the same rider-side effort, would have taken around 45 to 55 minutes longer. That estimate is not lab-grade. It depends on wind, drafting, assist cutoff, motor efficiency, and the giant assumption that I could hold the same effort for longer. But it is good enough to make the point: The e-bike probably turned what would have been a 5:15-ish ride into a 4:31 ride.

That is a big difference, but it is also not the same thing as sitting on the couch.

Hydration and Nutrition Still Mattered

The motor helped my legs. It did not fuel them.

I did not treat this ride like a mellow slow roll just because I was on an e-bike. I treated it like what it was: a hard, long ride that required a real nutrition and hydration plan. The weather helped. It was sunny, in the 60s, and not terribly humid, though the afternoon wind made the third lap harder than the temperature suggested. Heat was not a major problem. Effort still was.

My goal was about 90 grams of carbohydrate per hour. To keep myself on track, I used the reminder feature on my Garmin Edge to ping me every 10 minutes so I would drink regularly from my bottle, which was filled with sports drink. I also took a GU Original gel around the halfway point of each lap.

On laps one and two, I skipped the mile-20 aid station and stopped only at the start/finish. Each time, I refilled my bottle, ate one of the fruit skewers—pineapple, watermelon, banana—and put down about half a pack of GU Energy Chews before rolling out again.

Lap three was warmer and windier, and I drank more. I emptied my bottle just before the mile-20 aid station, so I made my only mid-lap stop there, refilled with sports drink, and rode the final 13 miles to the finish.

I finished tired, but not cracked. No cramps. No hunger flat. No gut revolt. After a long, hard ride, that is about as good as it gets. I have rarely finished a ride this long and this hard feeling so good, and I think the higher-carb fueling was a big reason.

The lesson is simple: Treat an e-bike ride like a real workout because it is one. Electric assist does not make fueling optional. If anything, it can trick you into underfueling because the ride feels more manageable early, while you are still doing real work and burning real energy.

There is also an e-bike-specific catch: The range extenders I used took up one of the bottle cages, meaning the bike only had room for one bottle on laps one and two. On this ride, the 33-mile loop and frequent aid stations made that easy to manage. On a hotter, unsupported, or point-to-point ride, using a range extender would mean carrying less fluid. That is not a small trade-off. I’d solve it with a race vest–style hydration pack.

So do not just ask, “Do I have enough battery?” Ask, “Do I have enough battery, enough water, and enough food—and do I know when I’m going to refill?”

What I Learned

So, can you ride a century on an e-bike?

Yes. Of course you can. But that answer is almost too simple.

The better question is whether you understand what that century is going to ask from the bike, and from you. How much climbing? How much wind? How fast are the groups? How is Eco mode tuned? What is the assist cutoff? Are you going to sit in, pull, ride solo, or bounce between all three because you have poor impulse control and wanted to try to bridge up to the next group on the road?

And then there are the boring questions, which are often the important ones: Where will you refill bottles? How much carbohydrate can you actually handle? What happens if a range extender takes up a bottle cage? How much battery margin do you want when the afternoon wind starts acting up?

For this ride, I brought more battery than I needed. Next time, on the same course, with the same setup and a similar forecast, I’d bring one 160Wh range extender. Not two. But I’m not mad I had the second. It bought peace of mind, and peace of mind is not nothing when you’re staring at 100 miles.

The e-bike did not make the century fake. It made it different.

It helped me ride faster than I would have without assist. It helped me stay with groups I might not have stayed with. It helped blunt the rollers, the wind, and the late-ride heaviness. But it did not eat for me. It did not drink for me. It did not keep my heart rate down or make my power numbers imaginary.

That is probably the lesson from the whole thing: The motor does not remove effort from the ride. But it does change the ride.

And if you respect that—if you plan the battery, the food, the water, the route, the weather, and the effort—an e-bike century is not some weird little loophole in cycling.

It is still a century.

You just get to decide, a little more precisely, how hard you want to work and where you want to spend yourself.