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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.
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.
In 1824, these units were replaced with a single system based on the imperial gallon. [a] Originally defined as the volume of 10 pounds (4.54 kg) of distilled water (under certain conditions), [b] then redefined by the Weights and Measures Act 1985 to be exactly 4.546 09 L (277.4 cu in), the imperial gallon is close in size to the old ale gallon.
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [1] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.
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A measure roughly equivalent to a British rundlet [68.19 (≈68) liters, 15 Imperial gallons]. 1 ahm (aum) = 97 kannen = 4 anker = 1 ⁄ 4 legger. [2] [38 Dutch gallons, 129 L iters, 31.6572 (≈32) Imp. gals.] An ahm (anglicised as "aum" - using the French spelling) was a Dutch and German measure of wine that was a fourth of a legger.
Many trucks were available with a front-mounted 20,000 lb (9,100 kg) capacity winch. [25] [26] [27] There were three wheelbases (Measurements are from the centerline of the front axle to the centerline of rear tandem). The short, used for tractors and dumps, was 167 inches (4.24 m), the long, used for cargo, wreckers, and bolsters, was 179 ...
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