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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).
Following the 1968 Consumer Reports announcement of the superiority of the radial design, radial tires began an inexorable climb in market share, reaching 100% of the North American market in the 1980s. [20] Radial tire technology is now the standard design for essentially all automotive tires, but other methods have been used. [26]
Hoosier Racing Tire [39] USA: 1957 Hoosier: Hutchinson SNC [40] France: 1957 Hutchinson Tires Inoue Rubber [41] Japan: 1926 IRC Tires Kelani Tyres Sri Lanka: 1990 CEAT [42] Kenda Rubber [43] Taiwan: 1962 Kenda, Kenda radial Kumho Tires [44] [45] South Korea: 1960 Admiral, Marshal, Kumho, Zetum, Trailfinder [46] Madras Rubber Factory [47] India ...
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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]
Starting in 1972 tires were specified by load rating, using a letter code. In practice, a higher load rating tire was also a wider tire. In this system a tire had a letter, optionally followed by "R" for radial tires, followed by the aspect ratio, a dash and the diameter – C78-15 or CR78-15 for bias and radial, respectively. Each diameter of ...
Radial tires were introduced to the U.S. market by rivals B.F. Goodrich and Michelin in the late 1960s, and Firestone lacked their own radial 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]