Key Features:Super Narrow Hyperglide (HG) series 10-speed compatible directional chain, recommended for Tiagra drivetrains,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 giving smoother shifting under high load, giving efficient pedalling, increased rigidity, and near silent running,For use with double chainset only,5.88 mm chain width, optimised for 10-speed Super Narrow HG drivetrains,Corrosion-resistant grey finish on outer plates,116 links, 277 grams (114 links).