189. タイヤ表示
タイヤ表示は、タイヤ側面に記載された文字と数字の列で、タイヤ幅、扁平率、構造、ホイール径、荷重能力、速度記号など重要な特性を示します。代表例は205/55 R16 91Vです。
車両に適した仕様のタイヤを使用します。必要なタイヤサイズや規格は通常、車両取扱説明書、適合証明書、メーカー情報で確認できます。
What does a tyre code such as 205/55 R16 mean?
205 indicates the nominal tyre width in millimetres, 55 is the aspect ratio between sidewall height and tyre width, R indicates radial construction and 16 indicates the diameter of the wheel rim in inches.
What do numbers and letters such as 91V mean on a tyre?
The number is the load index, which identifies the maximum load the tyre is designed to carry under specified conditions. The letter is the speed rating or speed-category symbol, which indicates the tyre's approved speed capability.
What other markings can appear on a tyre?
Tyres can carry additional markings indicating approval, manufacturer information, production date, suitability for winter conditions, reinforced construction or other technical characteristics. The exact markings depend on the tyre type and applicable standards.

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