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A cross-section of a tire. Number 12 indicates the radial ply. Numbers 14 and 16 are bias plies. A radial tire (more properly, a radial-ply tire) is a particular design of vehicular tire. In this design, the cord plies are arranged at 90 degrees to the direction of travel, or radially (from the center of the tire).
Increased fuel efficiency and tire mileage overcame the higher price of radial construction. According to a 1976 study, more police departments used steel or fabric radial-ply tires than belted bias-ply and bias or cross-ply tires for their pursuit cars. [15] Goodyear Polyglas tires are now manufactured for owners of period cars. [16]
Disadvantages, besides a higher cost than that of bias tires, are a harder ride at low speeds and generally worse performance on rough terrain. [48] [49] [26] Radial tires are also seldom seen in diameters of greater than 42 inches, as such tires are difficult to make. [50]
1967: Goodyear introduces the Polyglas tire, one of the first wide-tread bias-belted fiberglass tires, which along with similar tires from competitors such as the Firestone Wide-Oval would become regular equipment on 1970 to 1974 models, which would be superseded by radial tires beginning in 1975. 1969: Sales reach $3 billion
Tire uniformity refers to the dynamic mechanical properties of pneumatic tires as strictly defined by a set of measurement standards and test conditions accepted by global tire and car makers. These standards include the parameters of radial force variation , lateral force variation , conicity, ply steer, radial run-out , lateral run-out , and ...
The tubeless tire eliminate the need for an inner tube, which improves performance and safety, as well as enhanced comfort for the car's occupants. [5] BFGoodrich produced the first radial tires in the United States in 1965. This innovation made tires even safer as radial tires have longer tread life and permit better absorption of road bumps. [6]