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The strands of material forming the plies or layers of tire. Cords may be made from fiberglass, rayon, nylon polyester or steel. DOT Markings A code molded into the sidewall of a tire signifying that the tire complies with the Department of Transportation motor vehicle safety standards. The DOT code includes an alphanumeric designator that also identifies the tire's manufacturer, production plant, date of production and brand. ...
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