Super narrow Hyperglide (HG) series 10 speed compatible directional chain, recomended for Tiagra FC-4600 and FC-4650 chainsets.5.88mm chain width optimised for 10 speed Super Narrow HG drivetrainsCorrosion-resistant grey finish on outer plates116 links, 279 gramsFor use with double / compact chainsets onlyChain uses a directional design with specially 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 pedaling, increased rigidity and near silent running.