Hyperglide 40hg x41 series 10 speed directional dyna sys compatible chain for use with 10 speed mtb drivetrains hg x chain uses a directional design with specifically shaped inner and outer plates to optimise shifting over the chainset and cassette 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