* SRAM AXS enabled for easy personalization* Orbit chain management technology keeps drivetrain quiet and secure* A single rear derailleur for all gearing combinations, including 1x and 2x * Improved motor and signal travel for faster shifting* Larger X-SYNC pulleys and ceramic bearings for increased durabilityand efficiency* Compatible with existing eTap batteries* Battery not included* SRAM Model ID: RD-RED-E-D1