DID Black 520 VX3 Series Chain and Sprocket Kit. DID is an OEM of many Japanese and European brands. Leading racing teams in the road and off-road sports rely on the technology of DID. The development of the successor of the proven 520VX is also based on the long-standing experiences of DID in the MotoGP and fulfilled by the use of the patented X-rings even highest claims. Longer life and lower friction thanks to the patented X-rings By means of direct power transmission technology, the driver gets an incredible acceleration resonance in the throttle response, this is due to the state-of-the-art technology for increasing chain strength. 1x Black DID 520 VX3 Series Chain. Product Type: Chain and Sprocket Kit. Pin Diameter: 8.1mm. Plate Thickness – Inner: 2mm. Plate Thickness – Outer: 2mm. Tensile Strength (kgf): 3723kgf. Tensile Strength (kN): 37.3kN. Weight per 100 links: 1.51kg. You can send us a message by using the “Questions and answers” section towards the bottom of the page.