Hyperglide (HG) series 9-speed compatible chain, recommended for Deore and Tiagra 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-speedSuper Narrow HG drivetrains Corrosion-resistant grey finish on outer plates 116 links, 304 grams