Abstract: In a motorization of a conventional bicycle, there is an addition of a driven gear to the bicycle chain gear or gears in the bottom bracket area. The driven gear receives a chain from a drive gear, which is the output mechanism of a motor that is strapped to the frame of the bicycle, and transfers power from the motor to the bicycle chain gears that are fixed to this driven gear. Between the driven gear and powered bicycle chain gear or gears and the pedal crank shaft is a one way clutch, which is oriented so that the motor can turn and transmit its torque through the powered gears and bicycle chain to the rear wheel while the pedals are at rest. A second clutch is provided for the motor, which is not a one way clutch, but rather is a clutch that can be controlled in the degree of its engagement by the operator of the bicycle.