High performance 9-speed 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 controlTwo largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigiditySprockets are cut away and drilled to further reduce weight without reducing rigidityChrome-plated finish offers hard wearing resistance to corrosionChrome-plated steel cassette lockringFor Super Narrow 9-speed HG chainsWeight: 203 grams for 11 - 23T