Sram: On any surface you can imagine, in any drivetrain configuration, the Rival eTap AXS rear derailleur will handle it. Secure chain management and fast, precise shifting make for a smooth and quiet ride, every time.FEATURESWireless electronic eTap shift logic for intuitive shifting, easy setup and reliabilityCompatible with both 1x and 2x drivetrains36t cog max derailleur works with 10-28, 10-30, 10-33, and 10-36 cassettesSRAM AXS™ enabled, allowing easy personalizationChain management keeps the drivetrain quiet and secureX-SYNC pulleys for increased durability and efficiency SPECIFICATIONSSpeed (RD): 12sCable pull ratio: n/aCage (RD): n/aMax tooth: 36Color (RD): BlackPulley bearings material: SteelCage material (RD): Aluminum