Brompton has launched the new T Line Electric, its lightest electric bike yet, with a claimed 14.1kg weight including the removable battery pack and an 11.2kg weight for the bike alone. UK prices start at £5,799, while the updated Brompton Electric bike range is priced from £2,999.
The T Line Electric is powered by the Brompton e-Motiq rear-hub motor introduced on the Electric G Line when it was launched in 2024. The C Line Electric and P Line Electric bikes have also been updated to use the e-Motiq motor in place of their previous front-hub motor system.
"The new Brompton Electric range is our answer to the evolving way we live and move. We’ve kept everything people love about Brompton – the portability, the engineering, the joy of the ride – and added the intelligence and lightness to make it easier, smarter, and even more fun," says Will Carleysmith, Brompton's chief design and engineering officer.
At 14.1kg, the T Line Electric removes more than a kilogram in weight from Brompton’s ebike range, making it one of the lightest electric folding bikes.
Brompton launched its first ebike in 2017, based on the C Line’s all-steel frame. The C Line Electric has a claimed weight starting at 16.6kg for the four-speed model. It was joined in 2022 by the P Line Electric. This has a steel main frame, but with a titanium rear frame, and the four-speed bike has a claimed 15.6kg weight.
The T Line Electric is based on the pedal-only T Line, which has claimed weights starting from 7.45kg for the singlespeed bike and is made of titanium with a carbon fork and crankset, and a carbon seatpost with steel sheathing. Even the pedals are lighter than Brompton’s standard folding pedals.
New motor placement
The T Line Electric, like the C Line and P Line Electric 16-inch wheel bikes, is powered by the same e-Motiq motor as used in the G Line Electric 20-inch wheel folding bike.
The e-Motiq motor is toned down a little for the T, C and P Line bikes, with 250W output and 24Nm torque in place of the Electric G Line’s 30Nm torque. Brompton says that the output is calibrated to provide the same degree of rider support across the different electric bike lines.
All Brompton ebikes include a torque sensor to ensure the motor output matches that of the rider. They all share the same 345Wh removable battery, which sits in a clip-on backpack that’s attached to the handlebar.
Brompton claims a range of up to 90km for the e-Motiq motor in the T Line Electric. It says the motor system will learn and adapt to your riding style, developing an understanding of how you ride over the first 100km, then making changes every 6km to fine-tune its personalisation. It uses this data to make accurate predictions of the available range via the Brompton Electric app, which also supports over-the-air firmware updates.
The motor offers a Start Assist mode for speedy acceleration from stops and to give an extra boost for steeper hills. There’s also a Walk Assist mode to help you move the bike around more easily when you’re on foot, which will run the motor at speeds of up to 6km/h.
Electric system safety certified
There’s been a lot of negative publicity about the safety of electric bike batteries over the last few years. That’s down largely to low-quality batteries sold via online outlets, with fires often the result of users pairing them with mismatched chargers.
Brompton is at pains to stress the safety of its batteries, though, which are assembled in London and have been independently certified to meet international standards for electrical and fire safety. Its electric bikes carry a three-year electric system warranty.
Brompton says it is also one of the first ebike brands to be audited and listed on the Bicycle Association Register of Safety-Audited E-Bike Brands.
The Brompton T Line Electric is available for pre-orders via Brompton's site and its Brompton Junction store from 21 October and will be on general sale from Brompton and its 1,500 Brompton Accredited retailers from 28 October. It's priced at £5,799 / €6,799 / $TBA.
