Numérotation des pneus
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Définition
La taille d'un pneu est codée au format Largeur/IndiceAspect R Diamètre (ex. 205/55 R16), où la largeur est en millimètres, l'indice d'aspect est la hauteur du flanc en pourcentage de la largeur, et le diamètre est la taille de la jante en pouces.
Explication
A tire marked 205/55 R16 has a tread width of 205 mm, a sidewall height of 113 mm (55% of 205), fits a 16-inch rim, and has a total outer diameter of approximately 632 mm. The mixed-unit format — metric width and percentage, but imperial rim diameter — reflects the tire industry's historical evolution across US and European standards. Load index and speed rating letters are often appended (e.g., 91V), indicating maximum load and speed.
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RELATED TERMS
IMC (Indice de masse corporelle)
L'indice de masse corporelle (IMC) est un indicateur de dépistage calculé en divisant le poids d'une personne en kilogrammes par le carré de sa taille en mètres (kg/m²).
Unités de pression artérielle
La pression artérielle est mesurée en millimètres de mercure (mmHg), exprimée sous la forme de deux valeurs : la pression systolique (contraction du cœur) sur la pression diastolique (cœur au repos), par ex. 120/80 mmHg.