The SRAM 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.SRAM AXS enabled for easy setup personalization and reliability1x specific for use with SRAM 11-44t XPLR 10-44t XPLR and 10-36t cassettesChain management keeps the drivetrain quiet and secureItem SpecificationsLargest Cog44ColorBlackRear Der/Shifter CompatibilitySRAM eTap AXSRear Derailleur Mount Type10x1 StandardDrivetrain Speeds12Chain Wrap Capacity (teeth)34.