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Sizing Systems: Passenger Tire Sizing
Four sizing systems exist for passenger tires today, but we'll explain the two most commonly used: * P-Metric* European Metric P-Metric Examples: P215/65SR15, P215/65R15, P215/65R15 95S P = Passenger Car Tire 215 = Section Width in Millimeters 65 = Aspect Ratio R = Radial Construction 15 = Rim Diameter in Inches 95S = Service Description European Metric The aspect ratio is assumed to be 82 if not present in identification number. Examples: 155SR13, 155R13, 155R13 78S 155 = Section Width in Millimeters S = Speed Rating R = Radial Construction 13 = Rim Diameter in Inches 78S = Service Description Examples: 185/70SR14, 185/70R14, 185/70R14 88S 185 = Section Width in Millimeters 70 = Aspect Ratio S = Speed Rating R = Radial Construction 14 = Rim Diameter in Inches 88S = Service Description |
