Brompton C-Line 12 Speed Folding Bike 2025

The Brompton C-Line 12 Speed is a British-made steel folding bike designed for urban commuting and everyday mixed-use riding. Built in the company's characteristic style, the C-Line uses a steel frame and fork that fold laterally into a compact package. At 11.82kg, it's light enough to carry but sturdy enough to handle daily use. The Turkish Green colour gives it a distinctive look on the commute.

The 12-speed setup combines a 3-speed Brompton hub gear on the front with a 4-speed external derailleur on the rear, giving you range across a decent spread of gearing. The 50-tooth crankarm paired with a Brompton 4-speed cassette means there's flexibility for rolling hills and flatter routes without constantly wrestling with the chain. A YBN chain runs through the system. Braking is handled by Brompton rim brakes, which are simple and easy to maintain, though they're not as powerful as modern disc setups.

The 16-inch wheels fitted with Schwalbe Marathon Racer 35c tyres keep the fold tight while still offering decent roll and some weather-resistant capability. The Marathon Racer is a sensible choice for mixed urban surfaces—durable and relatively puncture-resistant. The compact wheel size makes the bike nimble in traffic and easy to manoeuvre when folded, though like all 16-inch folding bikes, you'll need to pedal more frequently to maintain momentum on longer flat stretches compared to larger wheels.

The riding position is controlled by mid-rise Brompton handlebars and an extended seatpost, giving you a moderately upright geometry that works well for city cycling and visibility in traffic. The Brompton saddle is designed for the brand's specific riding position, and the fold itself becomes routine once you've done it a few times.

This particular example is pre-owned in excellent condition, backed by the CE Guarantee with a 12-month warranty on the frame and three months on parts. Our inspection found marks to the rear frame, left fork leg and saddle, which reflects honest use. The bike is otherwise fully functional and ready to ride. It suits commuters who combine cycling with public transport, or anyone in a small flat who needs a bike that stores compactly. If you're looking for all-day touring range or something lighter still, you might explore other options, but for daily urban riding and portability, the C-Line 12 Speed represents a proven design that balances practical gearing with genuine folding convenience.