The Shimano CS-HG51 8-Speed Mountain Bike Cassette features Hyperglide Technology for precise, smooth shifting and is designed for trekking and MTB use. The sprockets are cut away and drilled to further reduce weight without reducing rigidity. A chrome-plated finish offers hard wearing resistance to corrosion. Close ratio gearing allows more efficient use of energy through finer cadence control. Features: - Steel spockets and lock ring- Chrome Plated- HG/IG 8-speed chain compatible

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