High quality 9-speed cassetteHyperglide sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under loadClose ratio gearing allows a more efficient use of energy through finer cadence controlGear ratios to suit all wheel sizes 26/27.5/29inchSprockets are cut away and drilled to reduce weight without reducing rigidityNickel-plated finish offers hard wearing resistance to corrosionCorrosion-resistant steel cassette lockringFor Super Narrow 9-speed HG chains