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