How to Read Your Tire Size

When it comes to your vehicle’s tires, understanding how to read the tire size is crucial. Properly sized tires not only ensure optimal performance but also contribute to your safety on the road. In this article, we will guide you through the process of deciphering your tire size.

Locate the tire size: To find your tire size, you need to look at the sidewall of your tire. You will notice a combination of numbers and letters engraved on it.


Decoding the numbers: The first number indicates the tire’s width in millimeters. For instance, if you see the number 205, it means that the tire width is 205 millimeters.


Understanding the aspect ratio: The ratio is the second number in the sequence and represents a percentage. It denotes the height of the tire’s sidewall relative to its width. For example, if the aspect ratio is 55, the size is 55% of the tire’s width.


Identifying the tire construction type: The following letter represents the construction type of the tire. For most passenger vehicles, you will likely see the letter “R,” which stands for radial construction. Other possibilities include “D” for diagonal or “B” for bias-belted.


Noting the rim diameter: The last number indicates the diameter of the wheel rim in inches. It denotes the size of the wheel that the tire can be mounted on. For instance, if you see the number 16, it means that the tire is designed to fit a 16-inch wheel.


Putting it all together, a typical tire size could be something like P205/55R16. In this example, “P” represents a passenger car tire. It is crucial to pay attention to this designation, as different vehicles may require specific tire types.

Remember, it is essential to always replace your tires with the size recommended by the vehicle manufacturer. Using the wrong size can affect your vehicle’s performance and compromise your safety. Consult your vehicle’s manual or contact a professional if you are unsure about the correct tire size.

In conclusion, knowing how to read your tire size is vital for maintaining the performance and safety of your vehicle. By understanding the numbers and letters on the sidewall, you can ensure that you choose the right tires for your car. Regularly inspecting and replacing tires with the correct size will go a long way in keeping you safe on the road.