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    tech mail

    Aug 19, 2019 4 minutes

    METRIC AND IMPERIAL TYRE SIZES

    On the sidewall of a tyre, why is the width in millimetres but the rim size in inches? For example, with a tyre size of 185/65 R14, the width is 185 mm but the rim size is 14 inches. Surely there ought to be a worldwide standard featuring only metric or imperial units?

    EBRAHIM ESSOP Johannesburg

    Doing some research shows early tyres carried only imperial sizes and apparently the width and aspect were fixed for each rim size, not like today where we have many tyre widths and aspect-ratio combinations for every rim size. When the Europeans adopted

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