The Shimano M770 XT Cassette – 9 Speed is a 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. The six largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity. The sprockets are cut away and drilled to further reduce weight without reducing rigidity. A chrome-plated finish offers hard wearing resistance to corrosion. Also comes with a chrome-plated steel cassette lockring. Available in two ratio options and designed for Super Narrow 9-speed HG chains. Weight 256 g for 11 – 34T.