Patent ID: 7184872
Filing Date: 2007-02-27
Classification: B62M,Y10T

Abstract:
1. A bicycle gearshift comprising: a rear actuator and a front actuator, each having a respective motor and each actuator displacing a chain through a guide element, the chain being displaced in an axial direction with respect to a respective gearshift group comprising at least two sprockets respectively associated with the hub of the rear wheel and with the axle of the pedal cranks of a bicycle, a means for generating a signal requesting a displacement of the chain from a first sprocket to a second adjacent sprocket of the respective gearshift group, an electronic control unit connected to the rear actuator and to the front actuator, operating to receive the displacement request signal and to drive the rear or front actuator, respectively, wherein the electronic control unit is suitable for driving the rear or front actuator, respectively, to displace a guide element of the chain from the first sprocket to an upwards gear-shifting position for the second sprocket if the first sprocket has a smaller diameter than the second sprocket, to a downwards gear-shifting position for the second sprocket if the first sprocket has a larger diameter than the second sprocket.