P (passenger car)
LT (light truck)
C (commercial truck
ST (special trailer)
In the example below, the "P" is used to indicate the tire is intended for Passenger Car use.
Example Tire Size: P 215/60/R 16 94V
To determine the right size tire for your vehicle, the best resource is your vehicle owner's manual or the sidewall of your existing tire. The sidewall will provide the exact sizing information from the tire manufacturer.