microSHIFT Estes Rear Derailleur - 7/8/9-Speed, Super Short Cage, 28-32t Max Cog, 11-14t Min Cog, 21t Capacity, BlackFor riders that want worry free shifting, Estes delivers. With robust wide set pivots, a more rigid body and cage, and high quality metric adjustment hardware, microSHIFT Estes rear derailleurs perform well above expectations. Product Specifics Largest Cog: 32 Rear Der Shifter Compatibility: Shimano Mountain Rear Derailleur Mount Type: 10x1 Standard Drivetrain Speeds: 7 Drivetrain Speeds: 8 Drivetrain Speeds: 9 Chain Wrap Capacity (teeth): 21 Cage