On any surface you can imagine, in any drivetrain configuration, the SRAM Rival eTap AXS Rear Derailleur can handle it. Secure chain management and fast, precise shifting make for a smooth and quiet ride, every time. FEATURES : Wireless electronic eTap shift logic for intuitive shifting, easy setup and reliability Compatible with both 1x and 2x drivetrains 36t cog max derailleur works with 10-28, 10-30, 10-33, and 10-36 cassettes SRAM AXS™ enabled, allowing easy personalization Chain management keeps the drivetrain quiet and secure X-SYNC pulleys for increased durability and efficiency SPECS : Color: Black Largest Cog: 36 Rear Derailleur Mount Type: 10x1 Standard Chain Wrap Capacity (teeth): 26 Cage Length: Medium Rear Der/Shifter Compatibility: SRAM eTap AXS Drivetrain Speeds: 12