20in used Fixed, Customized, Folding bike

This is a 20-inch Btwin folding bike in dark grey, customised extensively over years of London riding. The frame itself is the original Btwin, along with the front brake and front wheel, but virtually everything else has been swapped out and upgraded to suit the owner's riding style and preference. It's been ridden hard across London without mechanical issues, proving the fundamental build is sound beneath the modifications.

The bike started life as a standard Btwin folder with a V-shaped handlebar, basic pedals, and a freewheel chainset. The original wheels were thin alloy rims in silver. Since then, the owner has fitted a different handlebar for better control and comfort, replaced the pedals and saddle, upgraded to a fixed gear drivetrain, added a rear brake, swapped the rear wheel, and fitted BMX tyres for better grip and durability on city streets. These changes have made the bike more comfortable and stable to ride, with the fixed gear conversion giving it a more direct, responsive feel typical of track-style fixed bikes.

What you're getting is a working folder that's been thoroughly personalised rather than restored to stock. The 20-inch wheels keep the footprint compact for folding and manoeuvring through traffic, whilst the customised drivetrain and braking setup reflect real-world commuting choices. If you're after a used folding bike with character and proven reliability, and you like the idea of a fixed gear setup on 20-inch wheels for urban riding, this Btwin has genuinely earned its miles.