The Shimano SLX CS-M7100 12-speed cassette is optimized with rider-tuned gear combinations for MTB excellence. FEATURES: Advanced shifting performance provides the confidence to enjoy any trail Light and stiff construction reduces cassette inertia resulting in faster acceleration and increased chain security HYPERGLIDE+ technology provides better chain engagement, stronger retention, and smoother pedaling with greater power and confidence over rapidly changing terrain Designed with a Shimano Micro Spline body that features smaller and more widely distributed splines to limit cog damage on freehub The CS-M7100 cassette meets durability requirements for E-MTB applications SPECS: Cassette Body Type: Shimano Micro Spline Designed for ebike: Yes Drivetrain Speeds: 12 Range: 10-51 or 10-45