SRAM Rival XPLR eTap AXS Rear Derailleur - 12-Speed, 44t Max, Black, D1If your ride doesn't feel complete until you get a little dirt on your tires, you know the importance of capable components that can tackle anything. The SRAM Rival XPLR eTap AXS rear derailleur is a dedicated 1x specific unit designed for use with the XPLR 10 44 cassette. It makes for an uncluttered drivetrain that takes on pavement and singletrack with equal aplomb. Wireless and proven eTap shift logic, AXS connectivity and advanced chain management