Rival XPLR AXS E1 Rear DerailleurPerfect shifting through better design, even through the toughest gravel terrain. By using a Full Mount interface, the Rival XPLR AXS rear derailleur ensures perfect shifting with no adjustment screws, and unmatched resilience to whatever the world throws at you. Mud, loose rocks, or careless airline employees cant knock this out of adjustment. Wireless AXS shifting pairs with our smooth and strong chain management for an effortless, set and forget