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 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 264 g for 11 - 32T