Shimano 105 5800 11 speed road cassettehigh performance hg ev 11 speed 105 road cassette features hyperglide ev 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 largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity sprockets are cut away and drilled to further reduce weight withou