DID Gold 520 ERS3 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 letters ER at DID stand for “Exclusive Racing” and thus clearly determine the field of application of the 520ERS3. With its very low weight, it is suitable for both road and off-road racing. For those who want to get the last out of their machine. 1x Gold DID 520 ERS3 Series Chain. Product Type: Chain and Sprocket Kit. Seal Type: Non O-Ring. Pin Diameter: 8.1mm. Plate Thickness – Inner: 1.8mm. Plate Thickness – Outer: 1.8mm. Tensile Strength (kgf): 2630kgf. Tensile Strength (kN): 26.3kN. Weight per 100 links: 1.17kg. You can send us a message by using the “Questions and answers” section towards the bottom of the page.