• Passenger Tire Sizing

    Four sizing systems exists 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 (Load index and Speed Rating)

    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 (Load index and Speed Rating)

    With the aspect ratio included:

    Example: 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

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