Tire sizes are indicated by a series of numbers and letters on the sidewall of the tire. These numbers and letters provide information about the tires size, type, and performance. Heres what each part of the tire size means:

• Tire Type: The first letter in the code tells you what class of tire it is. For example, "P" stands for passenger vehicle tire, while "LT" means light truck tire.

• Tire Width: The three-digit number following the letter is the tires width from sidewall to sidewall, measured in millimeters.

• Aspect Ratio: The forward slash separates the tire width number from the two-digit aspect ratio. The aspect ratio is the height of the tires sidewall as a percentage of its width. The bigger the aspect ratio, the higher/taller the tires sidewall.

• Construction Type: The letter "R" indicates radial construction, which is the most common type of tire construction.

• Wheel Diameter: The last number in the tire size is the wheel diameter, measured in inches. For example, if the tire size is P215/65R15, the "15" means the tire would fit a rim with a 15-inch diameter.

In addition to these basic tire size measurements, there are other indicators on the tire sidewall that provide information about the tires performance, such as traction grades, temperature grades, and treadwear grades. Its important to choose the right tire size for your vehicle and driving needs, and a tire professional can help you determine the appropriate size range.