Shimano HG53 9 Speed Chain: The HG53 is designed for use with Shimano Hyperglide (HG) series 9-speed drive-trains & is recommended for Deore & Tiagra drive-trains. HG technology has chamfered inner plates to optimise shifting performance on HG sprockets Durability is assured through a chromising treatment on link pins, & the heat treatment of rollers, pins, & 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 outer plates 114 links, 304 grams