Shimano CS-HG81 10-Speed 11-34 Cassette

HG81 10-Speed Dyna-Sys cassette featuring light weight minimal design sprocket carrier The 3 largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity Hyper glide sprockets have a computer designed tooth configuration with contoured shift gates Close ratio gearing allows a more efficient use of energy through finer cadence control Sprockets are cut away and drilled to reduce weight without reducing rigidity