SRAM, Rival XPLR eTap AXS, Rear Derailleur, Speed: 12

Wireless electronic eTap shift logic for intuitive shifting, easy setup and reliability 1x specific for use with 10-44 XPLR cassettes and 10-36 cassettes SRAM AXS enabled, allowing easy personalization Chain management keeps the drivetrain quiet and secure Larger X-SYNC pulleys for increased durability and efficiency Compatible with existing eTap batteries (not included) SRAM Model ID: RD-RIV1-E-D1