Tire Size Fitment

Tire Size Fitment

Tire size calculator

99 ratings
72 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • July 6, 2014
  • September 10, 2026

Features

Tire Size Fitment screenshot #1 for iPhone
Tire Size Fitment screenshot #2 for iPhone
Tire Size Fitment screenshot #3 for iPhone
Tire Size Fitment screenshot #4 for iPhone
Tire Size Fitment screenshot #5 for iPhone
iphone
ipad
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About

Calculate tire and wheel fitment for your vehicle. This app helps you understand tire stretch, rolling radius, and speedometer error. It also allows for multiple wheel comparisons and saving results as images.

Wheel Fitment Calculation
Tyre Stretch Analysis
Rolling Radius Measurement
Speedometer Error Calculator
Multiple Wheel Comparison
Save Results as Image
Truck Wheel Calculator
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What users say

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What's New in Tire Size Fitment

4.1.1

September 10, 2026

Added possibility to restore past purchases

1

In-App Purchases

$2.99

Unlock app

You can work with several new setups in the iOS app with a one-time purchase.

User reviews

Update sucks

Since you updated it’s much harder to use, I can’t separate the wheels in the image anymore to quickly see which is bigger, and you falsely say a bigger wheel makes you go slower? No if your speedometer says 60 and you have bigger wheels it will be going faster. It’s also hard to select certain sizes as the curser only want to go to the front of number making it difficult to delete a single digit, double clicking selects the whole number and you have to type the whole number again.
There is no back button, you have to tab all the way through the numbers to get keyboard to disappear. It was so much cleaner and easier to use before. Now I wouldn’t even fathom of paying for this. There’s lots of free tire comparison apps which are free.
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Good

It’s good. Bought the app a couple of years ago because they said it was either the base app or premium with a one time purchase. Now it’s subscription and I lost access to everything I had and I’m forced to buy a subscription even though I already made the one time purchase years ago. It’s the only reason I give 3 starts, because it’s actually useful and good quality app.
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Выручало меня не рад

Лучшее приложение, очень простой интерфейс и без рекламы. За это отдельный респект. Пользуюсь уже несколько лет. Спасибо.

Это шедевр

Не знаю чуваки, чего вы ждете от этого приложения. Я считаю это просто шедевр. Я кучу колес уже прогнал через это приложение. Реально наглядно понятно что да как поменяется относительно сток колес. Или текущий колес. Резину найти подобрать, вылеты. Господи. Никита который это разработал. Чел, просто спасибо тебе большое. Ты очень меня выручил много раз уже!
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Great app

I wish the app can let you add the clearance between the tire and fender neigh but great app I love it

Developer apps

User experience

🐞

Reported Bugs

7 issues

Speedometer calculations are incorrect (reads higher when upsizing, lower when upsizing)

Bug

New version is in Russian with no option to change language

Bug

New version does not allow tire size changes

Bug

Half width input does not work

Bug

Measurements are backwards (speed error reversed)

Bug

Tire sizes too large for visual display

Bug

New version has incorrect axle centerline alignment

Bug

Requested Features

13 requests

Add clearance between tire and fender

Feature

Allow input of different front and rear sizes

Feature

Ability to select, zoom, and save pictures

Feature

360-degree view option

Feature

Option to switch between metric and imperial units

Feature

Include sidewall height calculation

Feature

Show speedometer reading vs. actual speed

Feature

Add option to enter knuckle or brake caliper clearance

Feature

Allow saving of different setups

Feature

Improve graphic representation of wheel size combinations

Feature

Add speed limit comparison above 60 mph

Feature

Allow input of half width values

Feature

Add inches option

Feature

FAQ

What does the Tire Size Fitment app do?

This app helps users calculate various aspects of tire and wheel fitment for vehicles. It provides tools to analyze tire stretch, rolling radius, and potential speedometer errors when changing tire sizes.

What are the key features of this app?

Key features include calculating wheel fitment, analyzing tire stretch, determining rolling radius, and a speedometer error calculator. It also allows for comparing multiple wheels, saving results as images, and includes specific calculators for truck wheels and clearance.

Is this app free to use?

The app is free to download and use, but it offers in-app purchases. This means some features or advanced functionalities may require an additional purchase.

Who would benefit from using this app?

This app is ideal for car owners, mechanics, and automotive enthusiasts who are considering changing their vehicle's tires or wheels. It helps them understand the implications of different sizes on performance and accuracy.

Can I compare different wheel and tire combinations?

Yes, the app allows for several wheels comparison, enabling users to see how different combinations might fit and perform. You can also save your results as an image for easy reference.