The Shimano Deore M591 SGS Rear Derailleur features the low-profile Shadow design and features direct cable routing and a strong guide spring to maintain chain tension and eliminate chainstay contact. Top-Normal shifting system is optimized for use with Shimano RapidFire shift levers and provides precise and rapid performance with a light shift effort.
Features Shimano's Double Servo-Panta mechanism for smooth consistent shifts
Light weight design
Optimized for use with Shimano 9-speed cassettes but will also work with Shimano 8-speed
Durable and reliable performance thanks to Shimano's proven technologies
Can be used on road bikes or mountain bikes
A great upgrade for improving the shifting performance of entry-level bikes