Abstract: A power assisting pedal (1) comprises a pair of rechargeable batteries (3) that provide power to a motor (5), which drives a drive shaft (7) via a gearbox (4). A screw-threaded spindle (8) engages a tapped hole (21) at the end of a crank arm (10), which is connected to a drive gear (11) of a cycle. A bearing (9) enables free rotation of the pedal (1) on the crank arm (10). The drive shaft (7) may engage with a freewheel device (20). In use, the cyclist keeps the pedal substantially level with his foot—as in a normal pedalling motion. This causes torque generated by the motor (5) to be transmitted via the drive shaft 7 to the crank arm (10) and thus to the drive gear (11), to give power assistance to the drive of the cycle.