The pedal crank will be above the back wheel, connected by long chains to two sets of gears.

To engage the pedals, the left-hand pedal crank could be rotated forward and locked and a drive gear engaged allowing the user to pedal.

Try fitting pedal cranks shorter than the standard 170mm.

Motorcycles are descended from the safety bicycle, a bicycle with front and rear wheels of the same size and a pedal crank mechanism to drive the rear wheel.

In this first chainless ebike, which folds down too, the pedals crank an alternator that converts effort into energy and stores it in a battery built into the frame.