The numbers and letters on a tire mean tire type, width, height to width ratio, construction type, diameter, load index, and speed rating. Some tires also list the severe weather rating. A typical tire size might read: P 205/65 R 15 92 H Here's what that means. P — This denotes a Passenger or P-metric tire built to U.S. standards. Here are other possible prefixes: LT is for a light truck. ST is for a special trailer. T is for temporary, usually indicating a spare tire. European-standard tires won't have a prefix letter at all. x0PiUKS.

what do tire sizes mean