Look for the tire size code on the sidewall, such as P215/65R15
P means passenger vehicle
215 is the tire width in millimeters
65 is the aspect ratio, or sidewall height as a percentage of width
R means radial construction
15 is the wheel diameter in inches
Check the load index after the size, if listed
Check the speed rating after the load index, if listed
Match the tire size exactly to your vehicle’s recommended size
Use the owner’s manual or driver’s door placard to confirm the correct size