Shimano alivio m4060 9 speed triple chainsettwo piece forged aluminium construction with a smooth and precise shifting performance due to its hyperdrive technology hyperdrive shimanos front shifting system is based on the hyperdrive concept the front derailleur hg chain and sg x chainrings all work together to make the front shifting action more reliable more precise and faster please note bottom bracket is not included features crank constructionhollowtech crank arm cassette compatibi