Hyperglide hg series 6 7 or 8 speed compatible chain recommended for altus and older alivio stx drivetrainshg technology has chamfered inner plates to optimise shifting performance on hg sprocketscomes with quick and easy to use connecting linkdurability is assured through the heat treatment of rollers pins and platesmushrooming of the pins gives unsurpassed side plate retention enabling the chain to far exceed the bsiso standard for breaking force73 mm chain width optimised for 7 and 8 s