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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. [29] 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.
Between 1999 and 2008, regulations required the tyres to feature a minimum of four 14 mm (0.55 in) grooves in them, with the intention of slowing the cars down. This is because a slick tyre, with no indentations, provides the most grip in dry conditions.
The first B-3A (S/N 30-281) was converted to Y1B-4 configuration with the addition of R-1860-7 radial engines and low pressure tires. Because of more powerful engines, the performance of the Y1B-4 was a slight improvement on the B-3, but the only difference between the two planes was their engines.
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 ...
ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes.
Many of the letter combinations have their origins in named trim levels, with DX and DL meaning "Deluxe," GL "Grand Luxe," SE "Special Edition," GT "Gran Turismo," and so on. In North America, long-running designations for high-performance trim levels include Chevrolet's " SS " (first introduced on the 1961 Impala ) [ 6 ] and Ford's "GT" (first ...