Brompton Lightweight Fixie with carbon parts upgrades

This is a Brompton fixie built around the principle of keeping weight as low as possible. It's a British-made steel folding bike that's been upgraded from the standard model with a focus on lightweight components. The frame folds down to a compact size suited to train travel or car storage, then unfolds ready to ride on flat ground or gentle hills without much fuss. At 8.95kg, it's genuinely light for daily use, though the seller notes that swapping to lighter tyres or a different chain would bring the weight down further if needed.

The bike runs as a fixed-gear single-speed with a centre-pull caliper brake at the rear. This setup keeps things simple and contributes to the overall lightness. The upgrades include a Selle Italia carbon seat, flat carbon bars mounted on a riser to get the riding position right, and brand new MKS pedals made in Japan. The seller is also including a set of unused Kojak tyres, which are among the lightest available for the 16-inch wheels. The bike has been stripped back to essentials without compromising practicality—there's no unnecessary weight, but it still works as a functional commuter or leisure bike for flat terrain and modest inclines.

Day to day, this folding bike is designed for convenience. You ride it to the station, fold it down to pocket size, then unfold it at your destination. The single-speed fixie nature suits riders comfortable with fixed-gear cycling, and the lightweight build makes it easy to carry when folded. The seller has found the project successful as it stands and hasn't pursued further modifications, suggesting the current setup balances weight, rideability, and practicality well.