Tire Size Calculator
Use our online tire size calculator tool that helps you to find the size of the tire easily within the fraction of seconds. To use this calculator tool all you need to do is give the inputs like year, make and model and then click on the calculate button that gives you the answers instantly.
What is Tire Code?
Car tires have an alphanumeric code that code is called a tire code. It will specify the size and type of the tire.
Here we will look into the code in brief to calculate the tire code.
This first part is used for intended use or the class of vehicle that the tire fits. Below are the other possible values.
- P: Passenger Car
- LT: Light Truck
- ST: Special Trailer
- T: Temporary
The next part of the code is 3 digit number that describes the nominal section of the tire or sidewall.
After that is a forward slash or also called an aspect ratio, for the character separation. There is a 2-3 digit number that represents the profile of the tire.
The next part of the code will be the internal construction of the tire. The inside of the tire is made up of piles of cord, this tire is mainly used for its strength and durability of the tire.
- R: Radial
- D: Diagnol
- B: Bias Belt
- If there is no letter, it should be assumed
And at last wheel diameter is indicated by the final 1 or 2-digit number. As we have a load index and speed rating, they are optional.
Tire Size Formula
The tire size calculator can be calculated by using the formula.
To find the tire size we need to know the sidewall height and tire diameter using the tire code.
Sidewall height = profile ratio x width / 100
Tire diameter = wheel diameter + (2 x sidewall height)
Steps to Calculate the Tire Size
Below are the guidelines that are given to calculate the size of the tire easily by hand.
- First, look into the code that was given in the problem.
- Then apply the formula.
- Substitute the values in the formula and simplify the equation.
- Finally, get the answer instantly.
Example problem for Finding Tire Size
Question: Find the tire size for the above code P215/65R15?
Solution:
Given,
Code = P215/65R15
Apply the formula,
Sidewall height = profile ratio x width / 100
= 65 x 215 / 100
= 139.75 mm
Tire diameter = wheel diameter + (2 x sidewall height)
= 15 + (2 × 5.5)
= 26 inches
Finally, the tire size is 139.75 mm and 26 inches.
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FAQs on Tire Size Calculator
1. How do you calculate the sidewall?
To calculate the sidewall, we multiply the profile ratio by the tire width and it will be divided by 100.
2. How to use this tire size calculator?
To use this calculator, a simple thing to do is give the inputs in the input fields and then click on the calculate button, so that you will get the answer instantly.
3. What is the best tool to calculate the tire size?
A tire size calculator is the best tool to calculate tire size.