microSHIFT R9 Rear Derailleur - For use with 9-Speed Shimano Compatible Road Systems, Short Cage, Black EA Rear Derailleur

RD-R42S-BK microSHIFT R9 Rear Derailleur - For use with 9-Speed Shimano Compatible Road Systems, Short Cage, Black Rear Derailleur EA Black Largest Cog 28 Rear Der/Shifter Compatibility Shimano Road Rear Derailleur Mount Type 10x1 Standard Drivetrain Speeds 9 Chain Wrap Capacity (teeth) 33 Cage Length Short Color Black