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. Six largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity. Double rivets on the 34T sprocket to the alloy spider for increased 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 256 g for 11 - 32T.