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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.
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.
Wheels with Asanti 28 in (710 mm) rims on a police Hummer H2 car. The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces.
Most passenger cars are advised to maintain a tire pressure within the range of 32 to 35 pounds per square inch (220 to 240 kPa) when the tires are not warmed by driving. [ 116 ] [ 117 ] Specification— Vehicle manufacturers provide tire specifications, including a recommended cold inflation pressure , to ensure safe operation within the ...
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.
As at January 2019, the wet grip tests for passenger car tyres (EU category C1) are specified in a 2011 amendment, Regulation No 228/2011 to the original 2009 Regulation No 1222/2009 "on the labelling of tyres with respect to fuel efficiency and other essential parameters". The wet grip index (WGI) is calculated from the results of two tests ...
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