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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. [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 inner width of the rim on which the tire is mounted should be about 65% of the tire's nominal section width for tires smaller than 30 mm and 55% for those larger. The section height of a tire is usually identical to its section width (for tires less than 28 mm, 2.5 mm have to be added to the width to get the height).
Off-roading tires may use a different measurement scheme: Tread width × Outside diameter, followed by wheel size (all in inches) – for example 31×10.50R15 (787 mm × 267 mm R380 in metric designation). The size of the wheel, however, is denoted as 8.5 in × 20.0 in (220 mm × 510 mm).
So although comparable PAX tires were heavier than conventional counterparts, they were not that much heavier (Michelin claims four PAX System assemblies are equal to the weight of 4.7 standard tire-wheel assemblies). However, rotating mass and unsprung weight of the wheels and tires on the ground increased, which is a disadvantage.
Traditional wired-on rims were straight-sided. Various "hook" (also called "crochet") designs re-emerged in the 1970s to seat the tire bead on the wheel rim and hold the tire in place, [10] [11] resulting in the modern clincher design. This allows higher (80–150 psi or 6–10 bar) air pressures than was possible older wired-on tires.
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.
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