SRAM Rival XPLR AXS Rear Derailleur - For Rival XPLR 1x, 13-Speed, 46t Max, UDH Hangerless, (Battery Not Included),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, can't knock this out of adjustment. Wireless AXS shifting pairs with smooth and strong chain management for an effortless, set and forget ride. 1x specific for