PEDAL CRANK DRIVE FOR BICYCLES OR THE LIKE

摘要

The invention relates to a pedal crank drive for bicycles or the like in which the effective length (1) of the pedal cranks (51) is increased on moving downwards and reduced on moving upwards by an adjusting mechanism. According to the invention, the maximum (48) of the effective length (1) of the pedal cranks is in the angular range (50) of 135 DEG +/- 30 DEG from the top dead centre (to) of the pedal position in the direction of thrust.