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.