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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
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 |
| 13 |
= Service Description |
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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