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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).
The first radial tire developed and produced by Firestone was the ill-fated Firestone 500 radial. Manufacturing of the new tire was performed on equipment designed to manufacture bias-ply tires. [41] During the 1970s, Firestone experienced major problems with the Firestone 500 radial. The Firestone 500 steel-belted radials began to show signs ...
The tire featured a whitewall on one side and a redline on the other, also common on the tire market at the time. The tire achieved relatively good sales being that Seiberling's Akron rivals had released good products to compete, including Goodyear 's Polyglas, Firestone 's Wide-Oval, Uniroyal 's Tiger Paw and BFGoodrich 's Radial T/A.
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]
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from competitors such as the Firestone Wide-Oval would become regular equipment on 1970 to 1974 models, which would be superseded by radial tires beginning in 1975. 1969: Sales reach $3 billion
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]
Spare or donut tire: Although many car manufacturers now include a short-term donut tire with new cars, a few still include a full-size spare tire. It is usually located in the trunk or under the ...
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