Tires come in a variety of diameters, ranging from 13″ to 22″. To find your vehicle’s wheel diameter or size, check the vehicle’s tire information placard on the inside of the driver’s side door. You can also find your tire size by checking the sidewalls of your current tires, where you’ll see a series of numbers and symbols similar to: P215/60 R17. The wheel diameter will be the last number in the series. In this example, the vehicle’s wheel diameter is 17″.