SRAM Rival 1 Rear Derailleur - 11 Speed, Medium Cage, Black/SilverThe 1x specific X Horizon derailleur design provides excellent chain control and shifts well regardless of cassette size. Roller bearing clutch and parallelogram design combine to minimize chain bounce, making the drive train safer and quieter over rough terrain Not compatible with multiple chainring drive trains Product Specifics Cage Length: Medium Chain Wrap Capacity (teeth): 32 Color: Black Silver Drivetrain Speeds: 11 Largest Cog: 42 Rear Der