Abstract
Abstract Since World War II the size and number of vehicles has increased greatly. Passenger cars have greater power and acceleration, whereas truck tires carry heavier loads at greater speeds. Earthmover vehicles now have heavier loads as well as greater traction. To keep up with the demands of the automotive industry, tire technologists have had to change from cotton and rayon cord to nylon, polyester, steel and aramid. Tire construction has changed from the conventional high aspect ratio to a lower one and from bias to radial design. A difference in thinking between European and American tire technologists appears based on different concepts of single and dual load capacities. The Americans (TRA) base their calculations on the dual load while the Europeans (ETRTO) base theirs on single load. This is not the principal argument, since both can use dual or single as the basis of calculating the tire load. Some do not believe in load calculation formulas; instead, they rely on their experience and estimation. It is not scientific to “estimate” the load of a tire by experience.
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