Brompton Electric T-Line Folding Electric Bicycle Review: Pocket-Sized Pedal Power

Ultralight for an electric bike. Natural-feeling power assist. Genuinely portable. Beautiful titanium construction. Power boost eats up hill starts.

TIRED

Removable battery pack means extra luggage to carry. Sub-16 mph max speed isn’t good enough.

The typical commuterelectric bike weighs between 40 and 65 pounds. The battery, motor, and components needed to hurtle you up hills can double, or even triple, the weight of a traditional bicycle. The new Brompton Electric T Line e-Motiq weighs just 31 pounds, and that’s with its 345-Wh battery attached. Remove the battery pack and it is a diaphanous 24.6 pounds. In comparison, the original steel Brompton Electric weighed 32.4 pounds, plus an additional 6.4 pounds for the battery.

Virtually anyone who has ridden an electric bike will attest to the fun, freedom, and convenience they offer. Almost everyone who has tried to lift a electric bike up a flight of stairs or onto a roof rack will be able to recommend a good chiropractor. For those without a garage or easily accessible shed, they can often feel as portable as a motorbike, just twice as easy to steal.

This new all-titanium electric Brompton solves all these issues. It is accessibly light, folds like only a Brompton can, and has an incredibly smooth ride thanks to the all-new 250-watt rear-hub motor. But damn, it’s expensive.

Titanium Time

Brompton’s lightweight frame is made almost entirely from aerospace-grade titanium. Parts are manufactured in Sheffield, an industrial city in the north of England, and then assembled in London. Why is this important? Manufacturing anything in the UK comes at a premium.

The unpainted frame is flawlessly finished, and the ultralight carbon forks and handlebars weigh next to nothing and look fantastic. It’s classy, and looks like the future, especially compared to my dependable, but hefty old steel Brompton.

Folded, it measures roughly 25.4 x 23.6 x 12.6 inches, which is small enough to sit under a desk or in an apartment hallway without getting in the way. The black plastic box housing the e-Motiq control unit is mounted behind the seat post and is uniquely ugly compared to the rest of the bike, with cables spewing from all angles. It is the only blemish on a beautiful design, and one born from complete necessity. The folding mechanism dictates every design decision for Brompton, and in reality, the box works and keeps cable routing tidy.

At the front sits the carrier block where the battery clips in. This luggage-mounting block keeps the weight on the frame and not the front fork, so handling isn’t affected. The battery is housed inside a six-liter capacity bag made from an ultra-high molecular weight polyethylene (UHMWPE) fabric that’s apparently 15 times stronger than steel. It weighs 6.4 pounds and has enough room for a bike lock and some lunch.

The weight of the battery—and what that does to the balance of the folded Brompton—means you need to carry it separately when not riding. I could usually find space in my large commuter backpack, but if not, you’ll be juggling bike, battery, and bags. Brompton does offer some larger battery-compatible bags if you need more space.

Power and Range

The power behind Brompton’s new electric bike range comes from the e-Motiq rear hub drive system. This proprietary tech replaces the previous front-hub layout with a rear-mounted 250-watt motor delivering up to 30 Nm of torque, while the 345-Wh battery has a range of up to 45 miles.

Disappointingly, Brompton hasn’t given the T Line Electric any more speed for US-based riders, so I’m afraid you’re limited to the UK speed limit of 15.5 mph instead of the Class 1 pedal assist maximum of 20 mph.

I first came across the e-Motiq system in 2024, when I tested the larger 20-inch Brompton G Line. This powerful rear-mounted motor, which can hit 20 mph, offered a more stable ride compared to the front-mounted design, and being pushed definitely feels more natural than being pulled along. The redesign also keeps the weight at the rear, so the folding mechanism remains balanced.

There are three power-assist levels available here, plus Push Assist (more on that below), and the e-Motiq system also adjusts based on your own riding style. It monitors pedal force and cadence. How often you stop and start and over your first 62 miles on the bike tweaks how the power is used. This isn’t to eke out out extra mileage, but to make your ride smoother and more natural.

During testing, I barely noticed any changes as I racked up the miles, but I was seriously impressed by how normal the bike felt. Well, normal for a marginally wobbly upright design with tiny 16-inch wheels. Yes, there was a surge of power as I started to pedal, but the initial acceleration was controlled. It felt more like I’d supercharged my legs, rather than strapped a motor to my bike.

My test bike was single-speed, but there is also a four-speed option available. Riding around London, I did not need more than one gear as the motor just takes the effort out of any hills. Endless traffic also means it’s harder to exceed top speed for long, but when the road did open, I was impressed by how easily it was able to transition between assisting and backing off the power to stick to 15.5 mph. I can only speculate, but on America's bigger roads, I think I’d want four gears. I’d also want a boost in the speed assist limit. It’s a shame Brompton only thought to include one of those things.

I also rode a few miles without the battery pack, and was pleasantly surprised. It weighs less than my old steel Brompton, and feels much nicer to carry, too. I hauled the Electric T Line e-Motiq up countless stairs, onto the London Underground, slung it in the trunk of a taxi at 2 AM, and only left it in a restaurant cloakroom once. It is light and small enough to just carry with you, and it’s also expensive enough that you’ll never lock it up and leave it on the street.

I’ve also been able to ride the nonelectric titanium Brompton T-Line, which at 17.64 pounds, was almost laughably light. If you don’t need electric power, it is the perfect commuter bike.

Control, Extras, and Competition

It’s tiny, but the handlebar-mounted controller does some cool things. There’s a start-assist button, that if you press just before you set off at traffic lights, or hit a hill for instance, will give you a powerful push to get you started. It's not a throttle—you need to be stationary though for it to kick in.

It's so teeny that I was delighted to find that the controller isn’t a touch screen. Instead, you rock the screen up and down to change power mode, alter brightness of the built-in lights, and check battery life and range.

There’s also an Electric Push Assist, which is a neat extra feature to take the effort out of walking with the bike. A couple of button presses and the bike will start rolling at about 3 to 4 mph, roughly normal walking pace. You don’t need to pedal, just hold onto the button and bars. I think the bike is light enough to not need this feature, but I imagine it will be useful for some.

The interface is not immediately intuitive and feels more like an older Garmin rather than an Apple Watch. That doesn’t make it bad, you just need to work out the sequences and practice. After initial testing, I didn’t rely on the controller for anything, which is more a testament to how good the bike is to ride around town, whatever the power setting.

The 345-Wh battery charges from empty to full in around four hours, and you can get a half-charge in roughly two hours, which is plenty for most city-length journeys. The charger is proprietary, so don’t expect your laptop’s USB-C to help in an emergency.

I like that electric bikes now come with built-in LED lighting, as they’re always charged and you never leave the house without them. Here is no different, with front and rear bulbs doing more than enough for safer urban riding. They aren’t high-lumen trail torches, but they’re more than adequa