Direct mount front derailleur:

The front derailleur of the Mach 4, 5 and 429 mount directly to the hollow bottom bracket forging. This locates the front derailleur perfectly to the crank and provides the most solid and accurate front shifting possible. The Firebird uses a floating derailleur mount that follows the suspension through its travel for the most accurate shifting of any long travel bike, plus it can be removed to accommodate a single ring IS chain guide system. Our systems, all use readily available Shimano front derailleurs.