8 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 sprockets are cut away to further reduce weight without reducing rigidity nickel plated finish offers hard wearing resistance to corrosion corrosion resistant steel cassette lockring for narrow 8 speed hg chains weight 380 g for 11 30t 9 speed cass