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The Shimano Acera HG20 9 Speed Cassette Great value 9-speed cassette. The 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 sprockets are also cut away and drilled to reduce weight without reducing rigidity, also comes with a corrosion resistant steel cassette lockring. For Super Narrow 9-speed HG chains.