# How to Calculate Tire Size

Do you know how to calculate tire size? It’s not as difficult as you might think! This blog post will walk you through the process of calculating tire size. This is an important skill to have if you are a car owner or driver.

Knowing your tire size can help you choose the right tires for your vehicle and ensure your car is safe to drive. We will also discuss different types of tires and what their sizes mean. So, whether you are a beginner or an expert on tires, this blog post has something for everyone!

### What Is Section Width On A Tire?

The section width on a tire is the tire’s width from sidewall to sidewall. This measurement is taken in millimeters and can be found on the tire’s sidewall.

The section width is important because it helps you determine what size tires will fit your car. If you have a vehicle with a wide body, you will need tires with a wider section width.

**Aspect Ratio**

The aspect ratio is the tire’s sidewall’s height compared to the tire’s width. This measurement is also taken in millimeters and can be found on the sidewall of the tire. The aspect ratio is important because it affects the height of the tire.

A higher aspect ratio means that the tire is taller, while a lower aspect ratio indicates that the tire is shorter. It would be best if you chose a tire with an aspect ratio that is appropriate for your car. If you have a car with a low profile, you will need tires with a lower aspect ratio.

**Sidewall Height Of Tire**

The sidewall height of a tire is the distance from the edge of the tire to the wheel. This measurement is taken in millimeters and can be found on the sidewall of the tire. The sidewall height is essential because it affects the size of the tire. A taller sidewall means that the tire is more significant, while a shorter sidewall means that the tire is smaller.

Now that we know the sidewall height let’s talk about how to calculate it. The sidewall height is calculated by multiplying the tire’s width by the aspect ratio. So, if you have a tire that is 225 millimeters wide and has an aspect ratio of 55, the sidewall height would be 225mm x 55% = 123.75mm.

**Sidewall = Section Width × (Aspect Ratio/100)**

**Overall Diameter Of A Tire**

The overall diameter of a tire is the distance from one side of the tire to the other. This measurement is taken in inches and can be found on the sidewall of the tire. The overall diameter is important because it determines the size of the tire.

A larger diameter means the tire is more prominent, while a smaller diameter means the tire is smaller. Now that we know the overall diameter let’s discuss how to calculate it. The overall diameter is calculated by multiplying the sidewall by two and adding the rim diameter. So the formula is

**Diameter = (2 × Sidewall) + Rim Diameter**

**What Is The Circumference Of A Car Tire?**

The circumference of a car tire is the distance around the outside of the tire. This measurement is also taken in millimeters and can be found on the sidewall of the tire. The circumference is important because it helps you determine the rolling diameter of the tire.

The rolling diameter is the distance the tire will travel in one revolution. This is important to know because it can affect the speedometer reading of your car. To calculate the circumference of your tire, you will need to know the tire diameter and Pi. To find the circumference, you will need to multiply the tire diameter by Pi, equal to 3.14.

**Circumference =Tire Diameter × π**

**Revolutions Per Mile**

Now that we know the circumference of the tire, we can calculate the revolutions per mile. This is the number of times the tire will go around in one mile. This measurement is important because it can affect the speedometer reading of your car. To calculate the revolutions per mile, you will need to know the tire’s circumference and your car’s mileage. The formula for this is

**Revolutions per Mile = 63,360 ÷ Circumference**

**Construction Type**

The construction Type of a tire is how the tire was put together. This can be found on the tire’s sidewall and is usually either “Radial” or “Bias.” The construction type is important because it can affect the performance of the tire.

Radial tires are usually made of softer compounds that can provide better grip. In comparison, bias tires are typically made of harder compounds that can provide longer tread life.

**Wheel Size**

The wheel size is the diameter of the wheel that the tire is mounted on. This measurement is taken in inches and can be found on the sidewall of the tire. You can find out the wheel size of your car by looking at the owner’s manual or tire sidewall. The last two number in the tire sidewall is the wheel diameter.

The wheel size is important because it can affect the performance of the tire. I hope this guide helped explain how to calculate tire size. If you have any questions, please feel free to comment below. Thanks for reading!