High performance 9-speed cassette. 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. Two largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity. Sprockets are cut away and drilled to further reduce weight without reducing rigidity. Chrome-plated finish offers hard wearing resistance to corrosion. Chrome-plated steel cassette lockring. For Super Narrow 9-speed HG chains. Weight: 203 grams for 11 - 23T.