Shimano Alivio RD-T4000-SGS Rear Derailleur - 9 Speed, Long Cage, Black Steel Center Channel: the result of

Center Channel: the result of extensive biomechanics studies on saddle positioning and on the structure of the human pelvis

Based on rider feedback and tailored to work with some posts' stiffer internal springs

super round CeramicSpeed balls contained in hardened-steel races are found on both versions

brakes and pedals

the IA 10 offers unrivaled precision and responsiveness

Shimano Alivio RD-T4000-SGS Rear Derailleur - 9 Speed, Long Cage, Black Steel Center Channel: the result ofColor: Black Largest Cog: 34 Rear Derailleur Mount Type: 10x1 Standard Chain Wrap Capacity (teeth): 45 Rear Der Shifter Compatibility: Shimano Mountain Cage Length: Long Drivetrain Speeds: 9