Hyperglide HG series 9-speed compatible chain recommended for Ultegra Deore XT and Nexave C900/C600 drivetrains. 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 exceed the BS/ISO standard for breaking force 6.57 mm chain width optimised for 9-speed Super Narrow HG drivetrains Corrosion-resistant grey finish on inner and outer plates Zinc-alloy silver finish on outer plates and grey finish on inner plates increase corrosion resistance 116 links 310 grams