Shimano Deore RD-M591-SGS Rear Derailleur black long 9-speed

9-speed compatible Shimano Deore rear derailleur in Wide Link design. The derailleur body guarantees improved firmness with precise shifting performance. The patented Shimano Double Servo-Panta mechanism keeps the read derailleur guide pulley at a uniform and constant distance from each sprocket. The results are light shift efforts with smoothly changing gears.
Top-Normal shifting system optimized for use with Shimano Rapid Fire shifting levers.
Material: body: aluminium
cage: steel