what is the difference between metric?
In our Tire Talk forum, some of our readers have questioned the interchangeability of P-metric and Metric tire size designations. But answering this question is like asking how to solve the national debt crisis. In other words, there are many answers, and some might be more practical solutions than others. There are two major size designations commonly used for passenger car tires, called P-metric and Metric sizing. If you see a âPâ in front of the tire size displayed on a tireâs sidewall it is a P-metric tire. If thereâs no P, itâs a Metric tire (also called Euro-metric or Hard-Metric).