Shimano deore hg54 hg x 10 speed chainhg x chain uses a directional design with specifically shaped inner and outer plates to optimise shifting over the chainset and cassette features outer plate design has been developed to reduce the chance of chain suck the inner plate has been developed for better contact with gears providing smoother shifting under high load giving efficient pedalling increased rigidity and near silent running durability is assured through a chromising treatment on link