What do the Numbers on a Tire Mean?

The numbers on the sidewall of a tire are dimensional measurements and descriptors of what type of tire it is. P225/50R15. The letters refer to general type of vehicle the tire is manufactured for and type of construction respectively. The numbers refer to width, height and size of tire respectively. When choosing tires, it is best to refer to the owners manual to see what tire the manufacturer intended for use on that vehicle.You can find more information here: