SRAM Force eTap AXS Rear Derailleur - 12-Speed, Short Cage - The SRAM Force eTap AXS rear derailleur is designed for both 1x and 2x systems. It capitalizes on X-Range? gearing technology for enhanced range and chain management, and features larger pulleys for improved durability and efficiency.A single rear derailleur for all gearing combinations, including 1x and 2xBattery sold separatelyCompatible with existing eTap batteriesLarger X-SYNC pulleys offer increased durability and efficiencyOrbit chain management technology keeps the drivetrain quiet and secureSRAM AXS enabled, allowing easy personalization