An extremely popular tyre size, 185/65 R15 tyres are widely used by small and compact passenger cars. Low rolling resistance, ride comfort, and low noise levels are generally the most sought after qualities in these products. The description contains relevant information regarding the tyre’s dimensions and construction.
The first number in this enumeration of indicators is 185. This is simply the tyre’s cross-section width, in millimetres. Thus, from sidewall to sidewall, this tyre is roughly 185 mm wide. The measurement is taken with the tyre fitted to the rim and without supporting any additional weight.
The number 65 indicates the aspect ratio, which relates to cross-section height, or the height of the sidewall, relative to width. In this case, sidewall height is 65% of the width (here, width is 185 mm). The letter ‘R’ indicates a radial tyre, and the number 15 tells us that 15 inch rims are needed for mounting.
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