Command Device for a Bicycle Gear Change

摘要

A command device for a bicycle gear change, comprising: a rotating drum ( 2 ) provided with a rotation axis (x) and being predisposed to rotate in opposite directions in order to wind at least a portion of a change-activating cable ( 3 ) on a lateral surface of the rotating drum ( 2 ); means for rotating, predisposed on command to rotate the rotating drum ( 2 ) in opposite directions according to predetermined angular steps; means for retaining predisposed to hold the rotating drum ( 2 ) in a position in absence of commands made to the means for rotating. The rotation axis (x) of the rotating drum ( 2 ) is perpendicular with respect to an advancement direction of the bicycle, that is, parallel to the rotation axis of the front wheel of the bicycle.