When the description displayed on the flank of a tyre reads as 215/40 R18, which is a common general pattern, this communicates certain information regarding the product’s dimensions. The first number is the width indicator. Therefore, this tyre belongs to the 215 mm width class - an approximate value, as the actual width of any individual tyre may be slightly smaller or greater, for instance 213, or 216 mm. Such minor variations are normal and tolerable, as the next standard width class is 225/40 R18; all such classes are set at 10 mm intervals from each other. Neither does flank height need to correspond exactly to specifications. This parameter, however, is not indicated as an absolute value. Rather, the second number in the description specifies the aspect ratio, describing cross section height in relation to width. Since this is a percentual value, it uses width as a reference; flank height is therefore 40% of 215 mm, specifically 86 mm. The third number in the description specifies the tyre’s inner diameter, expressed in inches.
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