* 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 and charger sold seperately* SRAM Model ID: RD-RIV-E-D1