With its BEAM SPIDER construction, the XTR M9100 12-speed cassette shaves weight while increasing SHIMANO's MTB gearing range another gear. Using SHIMANO's new MICRO SPLINE freehub body and HYPERGLIDE+ tooth profile, these 10-45 and 10-51T cassettes deliver the best MTB shift experience on offer.

• Definitive shifting
• Let you pedal continuously while shifting
• Increased acceleration by reducing inertia and weight by BEAM SPIDER construction
• New MICRO SPLINE * construction to engage FREEHUB body