A mid drive system for an electric bicycle, the mid drive system comprising: a pedal shaft with pedals for a rider; a mid shaft residing parallel with the pedal shaft; a first pedal shaft sprocket co-axial with the pedal shaft; a first mid shaft sprocket co-axial with the mid shaft; a first chain or belt rotationally couples the first pedal shaft sprocket to the first mid shaft sprocket; the mid shaft driven by the pedal shaft through the first pedal shaft sprocket, the first chain or belt, and the first mid shaft sprocket, and through a first uni-directional bearing, the pedal shaft rotationally coupled to the mid shaft by the first uni-directional bearing when the pedal shaft drives the mid shaft, and decoupled from the mid shaft when the pedal shaft is not driving the mid shaft; an electric motor rotationally coupled to drive the mid shaft; a drive sprocket fixedly rotationally coupled to the mid shaft; and a chain or belt coupling the drive sprocket to a bicycle wheel, characterized in that the electric motor is resided co-axially with the pedal shaft and rotationally decoupled to the pedal shaft by bearings; a motor sprocket resides co-axial with the electric motor; a second mid shaft sprocket reside co-axial with the mid shaft; a second chain or belt rotationally couples the motor sprocket to the second mid shaft sprocket; and the mid shaft is driven by the electric motor through the motor sprocket, the second chain or belt, and the second mid shaft sprocket, and through a second uni-directional bearing, the electric motor rotationally coupled to the mid shaft by the second uni-directional bearing when the electric motor drives the mid shaft, and decoupled from the mid shaft when the electric motor is not driving the mid shaft. a pedal shaft with pedals for a rider; a mid shaft residing parallel with the pedal shaft; a first pedal shaft sprocket co-axial with the pedal shaft; a first mid shaft sprocket co-axial with the mid shaft; a first chain or belt rotationally couples the first pedal shaft sprocket to the first mid shaft sprocket; the mid shaft driven by the pedal shaft through the first pedal shaft sprocket, the first chain or belt, and the first mid shaft sprocket, and through a first uni-directional bearing, the pedal shaft rotationally coupled to the mid shaft by the first uni-directional bearing when the pedal shaft drives the mid shaft, and decoupled from the mid shaft when the pedal shaft is not driving the mid shaft; an electric motor rotationally coupled to drive the mid shaft; a drive sprocket fixedly rotationally coupled to the mid shaft; and a chain or belt coupling the drive sprocket to a bicycle wheel, characterized in that the electric motor is resided co-axially with the pedal shaft and rotationally decoupled to the pedal shaft by bearings; a motor sprocket resides co-axial with the electric motor; a second mid shaft sprocket reside co-axial with the mid shaft; a second chain or belt rotationally couples the motor sprocket to the second mid shaft sprocket; and the mid shaft is driven by the electric motor through the motor sprocket, the second chain or belt, and the second mid shaft sprocket, and through a second uni-directional bearing, the electric motor rotationally coupled to the mid shaft by the second uni-directional bearing when the electric motor drives the mid shaft, and decoupled from the mid shaft when the electric motor is not driving the mid shaft.