Ultra-lightweight 12-speed MTB cassette for Micro Spline with close-ratio steps

Experience lightning-fast, silent, and precise shifting on the trail with Shimano's flagship component: the XTR M9100 12-speed cassette. This 10-45T variation is engineered specifically for XC and marathon racers who prefer tighter gear jumps (Rhythm Step) to maintain smooth cadence transitions through rhythm changes. Designed exclusively to mount onto Shimano's Micro Spline freehub body, it allows the inclusion of a 10T small cog for high-speed gearing. To achieve a featherlight total weight without sacrificing durability, this cassette features a hybrid material construction: aluminum for the largest cogs, lightweight titanium for the middle cogs, and durable steel for the smallest cogs.

• Micro Spline Mounting: Fits exclusively on Shimano Micro Spline freehub bodies.
• 10-45T Rhythm Step Progression: Closer ratio intervals between gears (10-12-14-16-18-21-24-28-32-36-40-45T).
• Featherweight Build (357 grams): Advanced tri-metal construction using titanium, aluminum, and steel.
• Hyperglide+ Technology: Provides seamless shifting up and down the cassette under heavy pedaling loads.
• Pro-Level XTR Quality: Built for high-level XC racers seeking optimal efficiency and reduced weight.