On any surface you can imagine, in any drivetrain configuration, the Rival eTap AXS rear derailleur will 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 Battery not included