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The sram xplr xg-1271 cassette offers a gear range of 440% and is designed for use on gravel and road. The tooth profile design which is tailored to electronic shifting ensures precise fast and smooth shifting across the entire gear range. - the x-range gearing gives you a wider range and smoother shifting so youre always in the right gear. - the 440% range provides the coverage that 1x gravel riders want. - for use with xplr 1x rear derailleurs only. - compatible with flat-top chains. - mini cluster technology with large aluminum sprocket for light weight and durability. - gradation: 10-44t: 101113151719212428323844