Shimano Deore M591 Rear Derailleur

This is a high performance, mountain bike rear derailleur, that is versitile enough to be suitable for on and off-road use, and is designed to appeal to a wide range of cycling fans.
It uses the classic double Servo-Panta mechanism, which gives precise chain movement, with light shift effort, for smooth gear changes.
It is compatible with 28-34T low sprockets and comes in Black or Silver.