The 215/45 R17 description offers specific information regarding tyre dimensions. The first number specifies width, expressed in millimetres. In this case, therefore, the width class is 215 mm, although individual tyres can be 213 mm or 216 mm wide, for example. These variations occur during the fabrication process or during measurement, when the tyre is mounted onto the rim, which induces slight deformation. In determining width, the greatest distance from sidewall to sidewall is measured.
Neither does the flank height of the tyre have to correspond exactly with class specifications. This parameter is determined using the aspect ratio indicator (the second number) and the width value. Aspect ratio is expressed as a percentual value that describes cross section height in relation to width. For the 215/45 R17 category, flank height is 96.75 mm (45 % of 215 mm). The third number indicates the inner diameter of the tyre, expressed in inches. This parameter, 17 inches in this case, is very important when choosing the right size of tyre that should be mounted onto a rim because the diameter of the rim must be equal to the inner diameter of the tyre, otherwise mounting will not be possible.
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