Here is an example of how to read one of the most popular tire sizes – P225/60R16. 1st Letter = Vehicle Type The first identifier is the letter in front. It represents the type of vehicle that the tire was designed for. It can be a P, T, LT, C, ST or have no letter at all. P – Represents a passenger vehicle. Passenger vehicles will include cars, minivans, SUVs, and small pickup trucks.
In this example, it would mean that the distance between the wheel rim and the outer edge of the tire is 65% of its width. R: This means that the layers of the tire radiate outward from the center. 16: The final two numbers describe the wheel’s diameter that the tire is recommended for, or the size of wheel measured from end-to-end. Types of Tires. On top of size, it’s important to understand the specific type of tires you need.