How to Read Tire Sizes: A Simple Guide

Are you feeling confused every time you need to replace your tires and see a string of numbers and letters that seem like a secret code? Don't worry – understanding tire sizes is easier than you think. At Utah Towing Guys, your go-to towing service in Utah, we want to make sure you have all the information you need to keep your vehicle running smoothly. So, let's break down the mystery of tire sizes in this simple guide.
Decoding the Numbers and Letters
Your tire's size is a series of numbers and letters displayed on the sidewall of the tire. It typically looks something like this: P215/65R16. Let's break it down:
1. Tire Type
The first letter in the sequence denotes the type of tire. Here are some common tire types you may come across:
- P: Passenger
- LT: Light Truck
- ST: Special Trailer
In our example, "P" indicates that the tire is meant for passenger vehicles.
2. Section Width
Following the letter(s) is a three-digit number (215 in our example) which represents the width of the tire in millimeters. This measurement is taken from one sidewall to the other.
3. Aspect Ratio
After the forward slash, you'll find a two-digit number (65 in our example) known as the aspect ratio. This number represents the percentage of the tire’s sidewall height compared to its width. In this case, the height is 65% of the width.
4. Construction
The letter "R" in our tire size example stands for radial construction. Radial tires are the most common type of tire construction for modern vehicles.
5. Rim Diameter
The last number (16 in our example) indicates the diameter of the wheel rim in inches that the tire is designed to fit.
Putting It All Together
Now that you know what each part of the tire size represents, you can better understand what tires your vehicle needs. For instance, if you see a tire size of P225/60R17 on your vehicle, you'll know that it's a passenger tire with a width of 225mm, a sidewall height that is 60% of the width, and designed to fit a 17-inch wheel rim.
Choosing the Right Tire Size
When it comes to replacing your tires, it's crucial to select the right size to ensure optimal performance and safety. Using the wrong tire size can affect your vehicle's handling, fuel efficiency, and overall driving experience. If you're unsure about the correct tire size for your vehicle, you can refer to your owner's manual or consult a professional at Utah Towing Guys for expert advice.
In Conclusion
Understanding tire sizes doesn't have to be a daunting task. By breaking down the numbers and letters on your tire's sidewall, you can easily decipher the information and make informed decisions when it comes to tire replacement. Remember, maintaining the right tire size is essential for safe and efficient driving.
At Utah Towing Guys, we're here to assist you with all your roadside needs, whether it's a tire repair, jump-start, or towing service. Contact us today for reliable and prompt assistance. Safe travels on the road!


