Shimano ultegra 6500 9sp cassette chain bundlesimilar to the dura ace the five largest sprockets are mounted on two light seperate alloy carriers that reduce weight and increase sprocket stiffness featureshigh performance 9 speed road cassettehyperglide 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 mo