SRAM has led the way with their 12-speed Electronic Rear Derailleurs and continues to amazing things. The Apex XPLR AXS 12-Speed Rear Derailleur is no different and offers an astonishingly easy set-up in comparison to mechanical and incredible shifting performance. 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.AXS enabled for easy setup, personalisation, and reliability1x specific for use with 11-44T XPLR, 10-44T XPLR, and 10-36T cassettesChain management keeps the drivetrain quiet and secureSpecification:Speed (RD): 12sCable pull ratio: n/aCage (RD): n/aMax tooth: 44Colour (RD): BlackPulley bearings material: SteelCage material (RD): Aluminium