The heart of the AXS ecosystem is lighter, more efficient, and more capable than ever. Covering cassette ranges from 10-28T up to 10-36T, this wireless wonder has larger pulleys to decrease chain articulation and increase efficiency, and an Orbit fluid damper to keep everything in place over the rough stuff. One derailleur ready for 1x or 2x, on road or off. FEATURES: Orbit chain management technology keeps the drivetrain quiet and secure AXS enabled for easy setup, personalization, and reliability 16 g lighter than previous generation Compatible with both 1x and 2x drivetrains Compatible with cassettes from 10-28T to 10-36T Larger X-SYNC pulleys for increased efficiency Compatible with existing AXS batteries