SRAM XG1251 D1 10-44 12s XDR SILVER RIVAL XPLR AXSFor use with XPLR 1x rear derailleurs Compatible with XDR driver bodies and Flattop chains Shift features on each cog are optimized for electronic shifting, so youll get fast, smooth and precise shifts every time X Range gearing gives you more range and a smoother gear progression, so youre always in the right gear 440% range gives the coverage 1x gravel riders want Mini Cluster technology for light weight and durability