The Sram Red eTap AXS rear derailleur is AXS enabled for easy personalization and designed for both 1x and 2x systemsOrbit chain management technology keeps drivetrain quiet and secureLarger X-Sync pulleys and ceramic bearings for increased durability and efficiencyCompatible with cassettes from 10-28T to 10-36T, for 1x and 2xImproved motor and signal travel for faster shiftingUse with XG-1270 10-36T cassette for maximum rangeCompatible with existing eTap batteriesCarbon cageRed eTap AXS12sp36tMedBLKUPC/EAN/GTIN: 710845862991