The SRAM RED eTap AXS rear derailleur is AXS enabled for easy personalization and designed for both 1x and 2x systems. Orbit advanced chain management technology keeps it silent and secure no matter the terrain. Component upgrades include faster pulleys, bearings, motors and signals, to improve speed in every way.36t-max derailleur is compatible with 10-36, 10-33, and 10-28 cassettesUse with XG-1270 10-36 cassette for maximum rangeBattery sold separatelySRAM AXS enabled for easy personalizationOrbit chain management technology keeps drivetrain quiet and secureShifting is optimized with an advanced motor and signal travelLarge X-SYNC pulleys and ceramic bearings for increased durability and efficiencyCompatible with existing eTap batteriesItem SpecificationsCage LengthMediumChain Wrap Capacity (teeth)39ColorBlackDrivetrain Speeds12Largest Cog36Rear Der/Shifter CompatibilitySRAM eTap AXSRear Derailleur Mount Type10x1 Standard