SRAM REAR RED ETAP XPLR AXS D1 12s BLACK 44T MAX BATTERY NOT INCLUDEDThe Red XPLR eTap AXS rear derailleur is a dedicated 1x specific unit designed for use with the XPLR 10 44 cassettes Wireless electronic eTap shift logic for intuitive shifting, easy setup and reliability Larger X Sync pulleys with ceramic bearings for increased durability and efficiency Orbit chain management technology keeps the drivetrain quiet and secure Sram AXS enabled, allowing easy personalization Compatible with existing eTap batteries Gap