SHIMANO XTR Cassette Sprocket CS-M9200-12 12-speed 9-11-13-15-17-19-21-24-28-33-39-45T

»9-45T Compact Drivetrain: When specified with smaller chainrings and the mid-cage XTR rear derailleur, the 9-45T XTR cassette provides a lightweight, ground-clearing option with a no-sacrifice 500% range.  »FREEHUB Compatibility: CS-M9200 is compatible with the MICRO SPLINE FREEHUB body standard. 9-45T is compatible with MICRO SPLINE FREEHUB standards and mounts with the use of a special lockring tool (TL-LR021).  »Build Materials: The strategic use of steel, titanium, and alloy ensures the CS-M9200 cassette is lightweight and robust enough to provide racer confidence.