Named after the shape of its telescopic black-and-silver frame. The A-Bike designed by Sir Clive Sinclair is the lightest and smallest folding bicycle in the world. Weighing 12.6 lbs (5.6kg) and claiming to fold down in under 10 seconds. The principle use for the A-bike is city or town travel over relatively short distances where you’re hopping on and off of buses and trains.