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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.
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).
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.
Tire inflation for passenger cars is typically about 30 pounds per square inch or 207 kilopascals . This is displayed on tires beside its metric equivalent. Post model year 2006 regulations also mandate an internationally standard "Tire and Loading Information" sticker which gives capacities in SI units followed by customary equivalents.
For bicycles with 700c wheels, some cyclists quote gear inches based on a nominal wheel diameter of 27 inches, corresponding to the old British tire size of 27 x 1 + 1 ⁄ 4" (ETRTO 630). Strictly speaking, the rolling diameter of a 700c wheel may be significantly higher or lower than 27", depending on the tire size, e.g. nearly 27.5" for a ...
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Metric, but some non-metric units are used for specific areas: rural land – alqueire; cattle weight – arroba; screen sizes – polegada (inch); tyre pressure – libra-força por polegada quadrada, but referred by its English abbreviation: psi. Peru: Peruvian (variants of Spanish) Metric, but inches (pulgadas) are used for screen sizes and ...
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related to: metric to inch tire chart