Patent ID: 8029396

Claim:
A front derailleur for a bicycle, comprising: a mobile member, provided with a chain-guide suitable for sliding engagement with a transmission chain of the bicycle and mobile between a first position and at least one second position; a fixed member, suitable for being fixed to a part of the bicycle frame; a first connecting rod, and a second connecting rod, hinged to the fixed member and to the mobile member, about four substantially parallel articulation axes so as to form a deformable articulated quadrilateral that moves the chain-guide between said first and said at least one second position; an actuation arm of said first connecting rod, provided with a driving area for controlling the derailleur through application of a thrust to the actuation arm so as to deform the deformable quadrilateral, wherein, at a first of said four articulation axes between the fixed member and the first connecting rod, the fixed member comprises a first forked structure that embraces the first connecting rod, and the first forked structure is defined by a first pair of flanges extending in a first direction, and at a third of said four articulation axes between the fixed member and the second connecting rod, the fixed member comprises a second forked structure that embraces the second connecting rod, and the second forked structure is defined by a second pair of flanges that extend in a second direction opposite from the first direction of the first pair of flanges, each flange of the second pair of flanges being substantially parallel to and laterally displaced, with respect to a corresponding flange of the first pair of flanges, in a same direction that is substantially perpendicular to the first direction.