Brompton C Line 12 Speed 2025

The Brompton C Line 12 Speed is a British-made steel folding bike designed for riders who need genuine portability without sacrificing everyday usability. Built around Brompton's lateral fold, it compacts down small enough to stow under a desk, in a train luggage rack, or behind a door, making it ideal for commuters who mix cycling with public transport or anyone working from a small space. The 16-inch wheels keep the folded package compact and manageable to carry, whilst remaining responsive enough for urban riding and mixed-terrain use.

This particular bike has been fitted with a 39-tooth chainring rather than the standard 50-tooth ring, which makes climbing hills considerably easier without compromising speed on flat ground or during cruising. For riders living in or regularly cycling through hilly terrain—like Dorset—this gearing choice is a practical advantage that seasoned Brompton owners recommend. The 12-speed transmission gives plenty of options to find a comfortable cadence across varied terrain, and the side-pull caliper brakes offer reliable stopping power in all conditions.

The bike comes with a Brompton Roller Frame rear carrier, an extended seatpost to adjust the riding position, a pump with full fittings, and a spare rear mudguard. The steel frame is finished in Matt Dune, a neutral beige colour that shows minimal signs of wear. This is a barely-used machine—just 42 miles since purchase in September 2025—and remains in unmarked, as-new condition throughout.