Shimano Dura ace R9100 11 speed CSR9100225

Super lightweight 11-speed hg-ev cassette with a rigid carbon and alloy carrier for excellent shifting even under the most demanding gear changeshyperglide ev 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 controllargest sprockets are mounted on lightweight alloy and carbon carriers to reduce weight and increase rigidity5 largest sprockets are made from titanium to reduce weight without sacrificing strengthsprockets are extensively cut away and drilled to further reduce weight without reducing rigiditynickel-plated finish offers hard wearing resistance to corrosionalloy cassette lockringfor super narrow 11-speed hg-ev chainsaverage weight 175 grams for 11-25 tooth