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Old 10-30-2015, 07:48 PM   #1
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Tire size metric or imperial

My tire size is 305/70R22.5
which is 305 millimeters
70 percent as high as it is wide (213.5 mils or 8.4 inches)
22.5 inch rim size, total diameter 22.5 + (8.4x2)= 39.3 inches

Now my question: Why would they mix metric and imperial??
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Old 10-30-2015, 09:27 PM   #2
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I think the North American auto industry was too attached to the Imperial rim sizing ( inches ) . If memory serves , Ford tried metric rim sizing in the 80's and when customers went looking for replacement tires there was a real up-roar.
Same thing happened when they tried metric sized plywood sheets.
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Old 10-30-2015, 09:58 PM   #3
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Re: why are tyres measured in metric/imperial??
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Old 10-31-2015, 09:15 PM   #4
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Interesting article but I think he had this bit backwards, a smaller diameter tire would make more revolutions causing an odometer to read higher.

Quote:
However, this 3% difference in diameter did cause some problems for the general
public in the US because standard automobile odometers indicated less mileage
using the reduced diameter of radial tires. The general public thought that the
radial tires were reducing their car’s fuel economy.
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