The Brompton Electric T-Line e-Motiq weighs 31 pounds with its battery attached. Strip the battery and that figure drops to 24.6 pounds — making it one of the lightest electric bikes available. The typical e-bike weighs between 40 and 65 pounds.
The frame is built almost entirely from aerospace-grade titanium. Parts are manufactured in Sheffield, then assembled in London — a supply chain that contributes directly to the $7,850 price tag.
Carbon forks and handlebars keep weight minimal. Folded, the bike measures roughly 25.4 x 23.6 x 12.6 inches — small enough to sit under a desk or in a hallway.
Motor and Battery
Power comes from the e-Motiq rear hub drive system, a 250-watt motor delivering up to 30 Nm of torque. The system replaces a previous front-hub layout. Being pushed from the rear feels more natural than being pulled, according to the review.
The 345-Wh battery clips into a carrier block at the front of the frame, keeping weight on the frame rather than the fork. It offers a claimed range of up to 45 miles.
The battery is housed in a six-liter bag made from ultra-high molecular weight polyethylene — a fabric the company describes as 15 times stronger than steel. The bag weighs 6.4 pounds and has room for a lock and lunch.
Three power-assist levels are available. The e-Motiq system monitors pedal force and cadence, adjusting output to match riding style.
The Tradeoffs
US riders are limited to a 15.5 mph top assisted speed — the UK legal limit — rather than the 20 mph Class 1 pedal-assist ceiling permitted in the United States. The review flags this as a meaningful shortcoming.
The battery must be carried separately when the bike is folded. Its weight shifts the balance of the folded package enough that stowing it inside a bag alongside the bike becomes necessary. Brompton sells larger battery-compatible bags for riders who need the extra space.
The control unit — a black plastic box mounted behind the seat post — is the one visual weak point. Cables run from multiple angles. The review describes it as “uniquely ugly” against an otherwise polished design, though it acknowledges the placement is dictated by the folding mechanism.
The original steel Brompton Electric weighed 32.4 pounds, with a separate 6.4-pound battery. The T-Line cuts total weight while integrating the same battery mass into a lighter overall package — though the portability problem of managing battery and bike separately remains.
According to the review, the ride quality is smooth, the power assist feels natural, and the hill-start boost performs well. The score lands at 7 out of 10.
Photo by G-FORCE Bike on Pexels
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