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.Orbit chain management technology keeps the drivetrain quiet and secureAXS enabled for easy setup personalization and reliability16g lighter than previous generationCompatible with both 1x and 2x RED drivetrainsCompatible with cassettes from 10-28t to 10-36tLarger X-Sync pulleys for increased efficiencyCompatible with existing AXS batteries (sold separately)