SRAM Force XPLR AXS eTap Rear Derailleur - 12-Speed Medium Cage 44t Max Battery Not Included Iridescent Gray D2SRAM Force XPLR AXS eTap Rear Derailleur 12 Speed Medium Cage 44t Max (Battery Not Included) Iridescent Gray D2. The SRAM Force XPLR AXS eTap rear derailleur is a dedicated 1x specific unit designed for use with a 10 44T or 10 36T cassette making 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 mean this derailleur does exactly