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.Features:- Wireless electronic eTap shift logic for intuitive shifting, easy setup and reliability- Compatible with both 1x and 2x drivetrains- 36t cog max derailleur works with 10-28, 10-30, 10-33, and 10-36 cassettes- SRAM AXS™ enabled, allowing easy personalization- Chain management keeps the drivetrain quiet and secure- X-SYNC pulleys for increased durability and efficiencySpecifications:- Speeds: 12- Max tooth: 36- Pulley bearings material: Steel- Cage material: Aluminum