How to read your Tire Size:
P = A tires designed for a Passenger vehicle
This is your tire type. Tires are designed for passenger vehicles (P) or light trucks (LT).
215 = Width of the Tire. This is measured in millimeters.
65 = Aspect Ratio. An Aspect ratio is the height of the tire's cross section to its width. The 65 means the height is equal to 65% of the tire's width. The bigger the aspect ratio, the bigger the tire's sidewall will be.
R = Construction. The letter "R" in a tire size stands for Radial, which means the layers run radially across the tire.
15 = Wheel Diameter is the size of the wheel measured from one end to the other. It tells us the size of the wheel that the tire is intended to fit. A size P215/65 R15 tire is made for a wheel with a 15" diameter.
Load Index indicates the maximum load that the tire can support when properly inflated. You'll also find the maximum load on the tire sidewall, in both pounds and kilograms.
Speed Rating tells you the maximum speed capability of a tire. Often speed ratings are matched to the top speed capability of the vehicle. For example, a tire with an H-speed rating has a maximum speed capability of 130 mph or 210 km/h. Goodyear does NOT recommend exceeding legally posted speed limits.
DOT Symbol: The letters "DOT" on the sidewall indicate that the tire complies with all applicable Federal Motor Vehicle Safety Standards in the United States.
Tire Identification Number: The series of letters and numbers following the letters "DOT." The TIN consists of up to 12 numbers and letters to identify the factory location and the week and year the tire was manufactured.
UTQG stands for Uniform Tire Quality Grading, a rating system developed by the U.S. Department of Transportation to provide consumers with information to help them purchase tires based on their relative treadwear, traction and temperature capabilities.