TheShimano CS-M8100 XT 12 Speed Cassetteuses Hyperglide sprockets that have a computer designed tooth configuration with contoured shift gates. This results in a crisp, smooth shift even under load. The close ratio gearing of thisShimanoM8100 XTCassette allows a more efficient use of energy through finer cadence control. Shimano CS-M8100 XT 12 Speed Cassette Features Largest sprockets are mounted on lightweight alloy carriers to reduce weight and increase rigidity Sprockets are cut away and drilled to further reduce weight without reducing rigidity 10-45T wide ratio gearing allows a more efficient use of energy through finer cadence control in ever changing trail conditions Chrome-plated finish offers hard wearing resistance to corrosion Alloy cassette lockring For use with 12-speed MTB chains Average weight: 461 g for 10-45T