Car Tire Sizes Explained: What The Numbers and Letters on Your Tires Mean
On the side of every tire is an alphanumeric system that describes the tire and its performance characteristics. The typical tire size system will appear as a string of letters and numbers such as: P215/70R16 100S
The first letter in the tire size indicates the type of tire and intended use. In this example, the first letter is 'P'? indicates the tire is a metric size used primarily on passenger vehicles. Other letter designations include T (Temporary Spare), LT (Light Truck Metric), C (Commercial), and ST (Special Trailer Service).