Experience the ultimate in cycling performance with this advanced rear derailleur, designed to excel on any terrain and in any drivetrain configuration. Whether you're tackling smooth pavement or rugged singletrack, this derailleur ensures secure chain management and rapid, precise shifting for a smooth and quiet ride every time.Wireless electronic eTap shift logic for intuitive shifting, easy setup, and reliabilityCompatible with both 1x and 2x drivetrains, making it versatile for various riding stylesSupports a maximum cog size of 44t, accommodating a range of cassettes including 10-28, 10-30, 10-33, and 10-36SRAM AXS™ technology enables easy personalization of your shifting experienceAdvanced chain management keeps the drivetrain quiet and secure, enhancing overall performanceX-SYNC pulleys are engineered for increased durability and efficiency, ensuring long-lasting use Battery sold separately; compatible with existing eTap batteries for convenience.