Patent ID: 7553247

Claim:
A bicycle sprocket shifting assembly comprising: an actuator comprising a motor that displaces, through a guide element, a chain in an axial direction with respect to at least two sprockets associated with one or both of the hub of the rear wheel and the axle of the pedal cranks of a bicycle, in a selected direction; manual input means comprising means for entering a displacement request signal of an actuator in the selected direction; and an electronic control unit connected to the input means and the actuator, operative, in a normal ride operating mode, to drive the actuator based upon the displacement request signal to displace the chain from a first sprocket to a second sprocket of the at least two sprockets; wherein the manual input means comprises means for selecting the operating mode at least between said normal ride operating mode and a setting operating mode; wherein the electronic control unit, in the normal ride operating mode, drives the actuator between a logic value associated with the first sprocket and a logic value associated with the second sprocket; and wherein the electronic control unit is operative, in the setting operating mode, to drive the actuator based upon the displacement request signal to displace the chain in the selected direction, the electronic control unit also having means for inputting information on the desired alignment between the chain and a predetermined sprocket of the at least two sprockets, and means, responsive to the means for inputting information on the desired alignment, for setting a biunique correspondence between a physical position of the actuator and the logic value associated with the predetermined sprocket.