The Apex XPLR AXS rear derailleur fits wide-range cassettes with 36T or 44T large cogs and incorporates a spring clutch for flawless chain management on or off-road. Innovative and intuitive eTap shift logic and AXS connectivity keeps Apex delightfully distraction-free.   Features AXS enabled for easy wireless setup, monitoring, personalization, and reliability. 1x specific for use with 11-44 T XPLR, 10-44T XPLR, and 10-36T cassettes. Chain management keeps the drivetrain quiet and secure.   Specifications Speed: 12. Max tooth: 44. Pulley bearings material: Steel. Cage material (RD): Aluminium. Drivetrain Configuration: 1x. Communication Protocol: AXS. Shift Technology: Wireless. Chain Technology: Road Flattop D1, Road Flattop E1.