Shimano CS-M5100 Deore 11-Speed Cassette Perfect for front single and double MTB drivetrains, Shimano's M5100-11 cassette offers Rider Tuned gear steps for maximum cadence control across the varied terrain of mountain biking. The distinctively designed Hyperglide sprockets incorporate specially positioned shift ramps and tooth profiles for improved chain control during shifting. Fast and responsive indexed shifting is the result. The HG cassette sprocket, which was developed for the MTB 10-speed system, underwent comprehensive optimization to achieve super-highly efficient shifting. Deore M5100 11-Speed cassette featuring light weight minimal design sprocket carrier. Hyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load Close ratio gearing allows a more efficient use of energy through finer cadence control. Sprockets are cut away and drilled to reduce weight without reducing rigidity For 11-speed HG-EV MTB chains.