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Automotive tires are described by several alphanumeric tire codes (in North American English) or tyre codes (in Commonwealth English), which are generally molded into the sidewall of the tire. These codes specify the dimensions of the tire and its key limitations, such as load-bearing ability and maximum speed.
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.
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For the 1981 season the maximum diameter of the rear tyre was limited to 26.0", while the diameter of the front tyres was increased. Therefore, from 1981 until 1992, Goodyear supplied white sidewall marked Eagle tyres with the sizes of 25.0"×10.0"–13" in the front and 26.0"×15.0"–13" in the rear. [6]
Nokian Tyres' three principal activities are the manufacture of passenger car tyres, heavy commercial tyres, and retail tyre sales. [24] As of 2008, Nokian is the most profitable tyre manufacturer in the world, [25] [26] at up to 18% earnings (before taxes and interest) relative to sales, compared to 14% at Bridgestone, 8% at Michelin, and 9.6% at Continental.
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. The spelling tyre did not reappear until the 1840s when the English began shrink-fitting railway car wheels with malleable iron.
ETRTO sizes apply to rims and tyres for vehicles of all types, including bicycles. The great advantage of ETRTO sizing is that it is unambiguous; previously, nominal dimensions were used which were interpreted in different ways by different countries and manufacturers - a problem for the end user.
Radial force variation or road force variation [1] (RFV) is a property of a tire that affects steering, traction, braking and load support.High values of RFV for a given tire reflect a high level of manufacturing variations in the tire structure that will impart ride disturbances into the vehicle in the vertical direction.
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