SRAM Rival XPLR AXS Rear Derailleur - For Rival XPLR 1x 13-Speed 46t Max UDH Hangerless Battery Not Included BLK/Silver E1SRAM Rival XPLR AXS Rear Derailleur For Rival XPLR 1x 13 Speed 46t Max UDH Hangerless (Battery Not Included) Black Silver E1. Perfect shifting through better design even through the toughest gravel terrain. By using a Full Mount interface the Rival XPLR AXS 13 Speed rear derailleur ensures perfect shifting with no adjustment screws and unmatched resilience to whatever the world throws at you. Mud or loose rocks cant knock this out of adjustment.