High performance 12-speed Micro Spline MTB cassetteHyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under loadClose ratio gearing allows a more efficient use of energy through finer cadence controlLargest sprockets are mounted on lightweight alloy carriers to reduce weight and increase rigiditySprockets are cut away and drilled to further reduce weight without reducing rigidity10-51T wide ratio gearing allows a more efficient use of energy through finer cadence control in ever changing trail conditionsChrome-plated finish offers hard wearing resistance to corrosionAlloy cassette lockringFor use with 12-speed MTB chains