Brompton Electric C Line review: the classic folding bike, now with the e-Motiq system

Brompton's folding bike has been a commuter favourite for decades, and the Electric C Line is its all-steel electric version. The current model moves to Brompton's own e-Motiq system, with a compact rear hub motor, a torque sensor, a new 345 Wh battery, a redesigned handlebar control and Brompton's first fully synced app. Earlier Brompton Electric bikes used a front hub motor, so the new drive is a real change in how the bike feels.

This Brompton Electric C Line review is based on Brompton's specifications, published coverage and rider feedback. We look at the fold, the new drive system, range, weight and who should buy it.

Design and the famous fold

The fold is still the reason to buy a Brompton. In a few seconds the bike becomes a compact package that fits in a train luggage rack, under a desk or in a hallway cupboard. Brompton's SuperRoll lets you wheel it when folded: raise the handlebar for Shopper Mode or drop the seatpost for Suitcase Mode. Adding the optional Roller Frame gives SuperRoll+, which has four rolling wheels on the base and shifts the balance so it feels lighter to push.

The C Line uses a steel frame that Brompton builds by hand in London. It comes with a folding pedal, a wide saddle and ergonomic grips. The lightweight battery sits in a secure mount and comes off with one quick release, so you can take it inside to charge.

The e-Motiq drive: motor, sensor and assist

e-Motiq is Brompton's in-house electric system. The compact rear hub motor drives the back wheel, and a torque sensor measures how hard you pedal and adjusts assist to match, which feels smoother and more natural than a simple on-off cadence sensor, especially on hills. There are three assistance modes, selected from a new, simpler handlebar control.

The C Line has four gears. That is enough for most city riding with motor help, but riders in very hilly areas may miss a wider gear range. Assistance is limited to the legal maximum in each market, which is 25 km/h in Europe and the UK.

Brompton Electric range and battery

Brompton says the 345 Wh e-Motiq battery gives up to 90 km per charge, depending on assist level, terrain and rider weight. Expect less if you use the highest assist on hilly routes. For most commutes that still means several days between charges.

The app gets better at predicting range as you ride. Over the first 100 km it learns your riding style, and it keeps refining its estimate every 6 km. The home screen remembers the battery level from your last ride, so you can check charge before leaving the house, and it also shows speed and trip distance and sends service reminders based on mileage.

Weight and portability

The Electric C Line weighs from 17.3 kg with the battery, or 13.8 kg without it. That is light for an e-bike but heavy to carry up long flights of stairs or through big stations, so most owners roll it rather than lift it. Taking the battery off first makes lifting noticeably easier. If weight is your top concern, the Electric P Line uses a titanium rear frame and carbon fork to save about 1.5 kg and gives a smoother ride, at a higher price.

Carrying luggage and ride quality

Brompton's luggage system mounts bags to the frame rather than the handlebars, so the steering stays stable when loaded. Its Electric bags have space for the battery and more, which suits shopping, overnight trips or sports kit.

On the road, the small 16-inch wheels make the bike nimble in traffic and quick to accelerate, but they transmit more of the bumps on rough surfaces than a full-size bike. It is best suited to city streets and shorter commutes rather than long rides on broken roads.

Is the Brompton Electric C Line worth it?

Brompton is premium-priced, and the electric version adds a lot more. You get a fold that no rival quite matches, a new drive that should feel smoother than earlier Brompton Electrics, a quick-release battery, independent UL 2849 safety certification and a long frame warranty. Brompton also says its electric bikes can go on most public transport, including Transport for London services.

If you commute by train, live in a small flat or need to store your bike at work, the Electric C Line is hard to beat. If you have space for a full-size bike or want long rides on rough roads, a full-size or larger-wheeled e-bike will be more comfortable for the money.

• Buy it if: you combine cycling with trains or have little storage space
• Skip it if: you never need to fold the bike or ride mostly rough roads

Key specs

Weight

From 17.3 kg; 13.8 kg without battery

Motor

Brompton e-Motiq compact rear hub motor with torque sensor

Battery

345 Wh e-Motiq, quick-release

Range

Up to 90 km, depending on assist, terrain and rider weight

Assist modes

3

Gears

4-speed

Frame

Steel, handmade in London

Certification and warranty

UL 2849; 7-year frame, 3-year electrical on registration

Alternatives to consider

• Tern Vektron Gen 4: A larger-wheeled folding e-bike with a Bosch motor and more range, though heavier and bulkier when folded.
• Brompton Electric P Line: The same e-Motiq system with a titanium rear frame and carbon fork, about 1.5 kg lighter.
• Specialized Turbo Vado SL 2: A lightweight full-size commuter for riders who don't need to fold their bike.

Frequently asked questions

The Brompton Electric C Line remains the best folding e-bike for people who mix cycling with trains, lifts and small spaces. The new e-Motiq system brings a torque-sensing rear hub motor, a quick-release battery with up to 90 km of range and a smarter app, while keeping the fold that made Brompton famous. It is expensive, heavy to carry for long and less comfortable than a full-size bike on rough roads. For true door-to-door urban commuting, few bikes are as practical.

How we research: Reviews are based on the maker’s specifications, published independent tests and owner reports. Scores compare the product with others in its class.