Patent ID: 6962544

Claim:
A front derailleur for a bicycle comprising: a fixed member having a mounting portion configured to be coupled to a frame portion of the bicycle, said fixed member including a first mounting flange and a second mounting flange axially spaced from said first mounting flange; a chain guide having a chain receiving slot to shift a chain of the bicycle in a transverse direction; and a linkage assembly coupled between said chain guide and said fixed member to move said chain guide between a retracted position and an extended position; said linkage assembly including a first link pivotally coupled to said fixed member at a first pivot point for rotation about a first pivot axis, a second link pivotally coupled to said first and second mounting flanges for rotation about a second pivot axis passing through said first and second mounting flanges that is substantially parallel to said first pivot axis, and a third link coupled to said chain guide and movably coupled to said first and second links to form a four-bar linkage together with said fixed member, said first and second mounting flanges having different axial widths, as measured along said second pivot axis, said axial width of said first mounting flange being at least about five times thicker than said axial width of said second mounting flange with said first mounting flange being at least partially aligned with said first link in a direction perpendicular to said first and second pivot axes.