D.I.D chain is used by the factory race teams and is the #1 chain manufacturer in the world. Solid rollers. Shot-peened parts. High cylindrical and roundness accuracy. Exacting tolerances provide low friction. Pre-stretched.. Extended riveted bushing "anti-kink" design. Special alloy steel. Average tensile strength of 6,700 lbs.. Includes clip link. 520 x 120, Natural
