The Shimano Deore XT CS-M8100 12-speed cassette is optimized with rider-tuned wide range and close step gear combinations for MTB excellence.Shift ramp designs provide fast and smooth shifts by HYPERGLIDE+ technologyLight and stiff construction reduces cassette inertia resulting in faster acceleration and increased chain securityDesigned with a Shimano Micro Spline body that features smaller and more widely distributed splines to limit cog damage on freehubThe CS-M8100 cassette meets durability requirements for E-MTB applicationsItem SpecificationsCassette Cogs10-12-14-16-18-21-24-28-33-39-45-51ColorSilver/BlackDesigned for ebikeYesCassette Body TypeShimano Micro SplineRange10-51Drivetrain Speeds12Defined ColorSilverWeight470