The Shimano HG54 10 Speed HGX Chain is optimised for Shimano 10-speed HG-X MTB drivetrains only & has a grey corrosion-resistant finish on both inner & outer plates. It uses a directional design with specifically shaped inner & outer plates to optimise shifting over the chainset & cassette. The inner plate has been developed for better contact with gears providing smoother shifting under high load, giving efficient pedalling, increased rigidity & near silent running & the outer plate design has been developed to reduce the chance of chain suck. Chromising treatment on link pins, & the heat treatment of rollers, pins, & plates increases durability & mushrooming of the pins gives unsurpassed side-plate retention, enabling the chain to far exceed the BS/ISO standard for breaking force.