Hyperglide hg series 9 speed compatible chain recommended for ultegra deore xt and nexave c900c600 drivetrainshg technology has chamfered inner plates to optimise shifting performance on hg sprocketsdurability is assured through a chromising treatment on link pins and 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 force657 mm chain width optimised for 9 speed super n