Gearshift control device for chain and sprocket transmission system of bicycle, has floating ring having connection member for connection with pulley, positioning element and control element

摘要

The gearshift control device has a pulley (40) having a driving member that is non-centered or non-concentric with respect to the axis of a shaft (45). A control element (57) is mounted to rotate freely about the shaft with a blocking device. A floating ring (50) has a connection member for connection with the pulley, a positioning element (52) and the control element.