Front derailleur with variable attachment to a bicycle frame

A front derailleur attachable to a bicycle frame comprising:

• a base member having first and second pivot points, an elongated opening and a fastening slot for receiving a threaded insert having an asymmetrically positioned threaded bore therein, the threaded insert having alternative mounting positions within the fastening slot corresponding to first and second attachment positions of the threaded bore, the first and second attachment positions having centerlines;
• a chain cage;
• a parallelogram including two parallelogram arms, each having first and second ends, the first ends pivotable about the first and second pivot points of the base member, the second ends supporting the chain cage;
• and
• an attachment member for alternatively connecting the base member to a mounting socket of the bicycle frame through the elongated opening to one of the first and second attachment positions of the threaded bore, the base member having a contact surface for mating with the mounting socket, the centerlines of the first and second attachment positions of the threaded bore and substantially aligned with a centerline of the lower of the first and second pivot points.