SRAM X01 Eagle AXS Rear Derailleur - 12-Speed, Long Cage, 52t Max, Battery Sold Separate, Black/RedThe SRAM X01 Eagle AXS 12 speed rear derailleur is specifically designed and optimized to be motor driven instead of cable actuated to operate with other Eagle AXS components. Designed for a max 52t large cog The AXS powered component enables customization and scales to an individual rider s liking via the SRAM AXS App It features a shorter cage for 10mm more ground clearance, with more chain wrap on the cassette to sit slightly further forward, and