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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 ...
UTQG ratings on sidewall of Toyo Tires Proxes R39 tire UTQG ratings (top) and tire code (bottom) on sidewall of Continental ContiProContact tire. Uniform Tire Quality Grading, commonly abbreviated as UTQG, is a set of standards for passenger car tires that measures a tire's treadwear, temperature resistance and traction.
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 ...
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 word tire is a short form of attire, from the idea that a wheel with a tire is a dressed wheel. [3] [4] Tyre is the oldest spelling, [5] and both tyre and tire were used during the 15th and 16th centuries. During the 17th and 18th centuries, tire became more common in print.
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]
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Rolling resistance is the main key factor in measuring the energy efficiency of a tyre and has direct influence on the fuel consumption of a vehicle. A set of tyres of the green class "A" compared to a "G" class can reduce fuel consumption by 9% [3] of a passenger car; even more for trucks.
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