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Often, these harmonics have known causes, and can be used to diagnose production problems. For example, a tire mold installed with 8 segments may thermally deform as to induce an eighth harmonic, so the presence of a high radial force eight harmonic (RF8H) would point to a mold sector parting problem. RF1H is the primary source of ride ...
In 1999, Sumitomo and Goodyear began a joint venture by which Sumitomo continued to manufacture all Japanese-made tyres under the Dunlop name, while Goodyear Tire and Rubber Company bought 75% of the European and North American tyre businesses of Sumitomo. [10] The company has extensive manufacturing operations throughout the world.
Goodyear's success was partly due to the challenge posed by radial tire technology, and the varied responses. [18] At the time, the entire US tire industry produced the older bias-ply technology. Estimates to fit factories with new machinery and tools for making the new product were between $600 million and $900 million.
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]
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).
In 1989, Goodyear planned to roll out its new radial tires at the Daytona 500. Ideally, the race would definitively prove radial tires' superiority to Hoosier's bias-plys . But Dale Earnhardt and Elliott experienced tire failures during practice, breaking Elliott's wrist, and Goodyear withdrew the radial tires from Daytona. [ 13 ]