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Goodyear Polyglas redline E70x14 tire. Goodyear Poluglas tires were available as standard equipment in the late 1960s and early 1970s muscle cars from General Motors, Ford, Chrysler, and American Motors. [5] There were also comparable tires from competitors such as the Firestone Sup-R-Belt Wide Oval and Atlas Plycron 2plus2.
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 wet grip index (WGI) is calculated from the results of two tests specified in the regulations. The first test measures the maximum achievable average deceleration of a vehicle as it slows from 85 ± 2 km/h (52.8 mph) to 20 ± 2 km/h (12.4 mph). The second test (the "skid trailer" test) is usually performed using a tow vehicle and trailer.
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
The Goodyear Tire & Rubber Co. - Passenger car tires Findlay, Ohio, United States: UP/1UP: Cooper Tire & Rubber Co. - Consumer Tires, Technical Center, Tire Molds Gadsden, Alabama, United States: MD/1MD: The Goodyear Tire & Rubber Co. - Passenger car tires Hebron, Ohio, United States: P1/1P1: The Goodyear Tire & Rubber Co. - Development Center [75]
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. The UTQG was created by the National Highway Traffic Safety Administration in 1978, a branch of the United States Department of Transportation (DOT). [ 1 ]
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