For use with XPLR 1x rear derailleursCompatible with XDR driver bodies and Flattop chainsShift features on each cog are optimized for electronic shifting, so youll get fast, smooth and precise shifts every timeX-Range gearing gives you more range and a smoother gear progression, so youre always in the right gear440% range gives the coverage 1x gravel riders wantMini Cluster technology for light weight and durability10-44t12sp10,11,13,15,17,19,21,24,28,32,38,44SilverXLPR XG-1251XDRUPC/EAN/GTIN: 710845869006