The shimano cn7701 dura ace 9 speed chain a hyperglide hg series 9 speed compatible chain recommended for xtr and dura ace drivetrains shimano cn7701 dura ace 9 speed chain features hg technology has chamfered inner plates to optimise shifting performance on hg sprockets durability is assured through a chromising treatment on link pins and the heat treatment of rollers pins and plates mushrooming of the pins gives unsurpassed side plate retention enabling the chain to far exc