Shimano xt m770 9sp cassette chain bundlehigh quality mega 9 gearing with close ratio sprockets and hyperglide design for efficient shifting featureshigh performance 9 speed 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 controlsix largest sprockets are mounted on a lightweight alloy carrier to reduce weight and