Features SRAM XPLR XG-1251 Cassette 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 For use with XPLR 1x rear derailleurs Compatible with Flattop ch
XDR
The XDR drive actuator is a universal mounting system for cassettes with sprockets of less than 11 teeth. It enables lighter and more versatile drives without the need for new axle standards, hub conversions or even new cassette tools. The XDR interface is 1.85 mm longer than XD and is designed for racing hub applications. XDR drive units are compatible with all XD cassettes when the cassette is installed with a 1.85 mm spacer behind it.
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