Shimano chain for precise shifting hyperglide hg series 6 7 or 8 speed compatible chain key features hg technology has chamfered inner plates to optimise shifting performance on hg sprockets comes with quick and easy to use connecting link durability is assured through the heat treatment of rollers pins and plates mushrooming of the pins gives unsurpassed side plate retention enabling the chain to far exceed the bsiso standard for breaking force 73 mm chain width optimised