Super lightweight 10 speed cassette with a rigid alloy carrier for excellent shifting even under the most demanding gear changeshyperglide 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 a lightweight alloy carrier to reduce weight and increase rigidity4 largest sprockets are made from titanium t