# Tire Sizes - % Differences in Tire & Wheel Sizes

> App for calculating tire size differences and understanding tire specifications. (iPhone/iPad app by Chewy Applications.)

- Source: https://appshunter.io/ios/app/tire-sizes-differences-in-tire-and-wheel-sizes/id757897895 (this page in markdown: same URL + `.md`)
- Developer: [Chewy Applications](https://appshunter.io/developer/415417492)
- Category: Reference, Utilities
- Price: $0.99
- Rating: 3.50/5 from 2 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 8.0 · 2 MB
- Languages: American English
- Released: 2013-11-24
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/tire-sizes-differences-in-tire-and-wheel-sizes/id757897895/reviews.md

## What is Tire Sizes?

A comprehensive app for all your tire sizing needs.

The Tire Sizes app provides tables for calculating the percentage difference in tire sizes when you're looking to replace your tires and/or wheels.  It also includes extensive reference material on everything you need to know about your tires, from the information on your tire's sidewall, displayed in both table and glossary format.

Useful for:
• Calculating the difference between your current tire/wheel size and your new setup i.e. when buying larger rims and low profile tires for your vehicle that maintain the same tire circumference.
• Making sure that your speedometer will not need adjusting when you change tire and/or wheel size.
• Helping you make an informed choice when buying new tires by explaining tire specifications and capability.
• Getting a better understanding of your tire's specifications for correct use and care i.e. the max inflation pressure for your tires.
• Converting units of measurement and tire pressure.

Increments & Accuracy 
• Tap the bottom bar buttons to choose alternative increments (e.g. 1 psi, 2, psi, 5 psi, 10 psi). 
• The table defaults to the largest increment available. 

Search Function
• Scroll up within a data table to reveal the search box.

More Units 
• Some tables have too many 'to' units to fit in the iPhone portrait position. Rotate your iPhone to the landscape position to show more conversion units (where available). 

Broad Categories
• Choose New Tire Size - tables showing tire diameter, circumference and percentage difference between them.
• Glossary - including Tire Sidewall Diagram
• Detailed Tire Size Information - information from the tire code.
• Load Index
• Speed Rating
• Load Range
• Tire Pressure Unit Conversion
• Measurement Unit Conversion

Specific Units Included 
• Millimeters, Inches
• Pounds, Kilograms
• Miles per Hour, Kilometers per Hour
• Pounds per sq. Inch (psi), Kilopascals (kPa), Bar (bar), Kilogram per sq. cm (kg/cm²)

Universal App 
This means you only need to buy it once to be able to install it on all your devices (iPhone, iPod Touch, and iPad). 

If you find this app useful, please leave a review on the App Store. 

If you have suggestions, feature requests, or need support, feel free to contact us through the Settings menu within our apps.

## Key features

- Calculate tire size percentage differences
- Reference material on tire specifications
- Glossary of tire terms
- Unit conversion for measurements and pressure
- Information from tire codes
- Load index and speed rating details

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/tire-sizes-differences-in-tire-and-wheel-sizes/id757897895/reviews.md

### 1/5 — Not all it appears to be

*2024-03-03*

I downloaded this app to do tire conversions and percentage of difference calculations between stock and aftermarket tires. The app is not what it proclaims to be. It is not user friendly, it’s cumbersome, and more complicated than necessary. I expected table options where I could insert tire sizes in dropdown menus and automated fields. Instead, I got reference tables. There are many free options in the App Store that are more user friendly.

### 1/5 — Rubbish!

*2017-01-20*

Don't waste your money, not all tyre sizes are listed on here so a waste of time, I want my money back!

### 2/5 — It works !!

*2016-10-13*

It's a ok app some things that need work. They need to list all the tires made.(including Ag and construction) A wheel torque chart would be nice with this app also.

## Frequently asked questions about Tire Sizes

### What is the price of Tire Sizes?

Tire Sizes is a paid app, available for $0.99. This one-time purchase allows installation on all your supported devices.

### Does Tire Sizes have ads?

No, Tire Sizes is ad-free, providing an uninterrupted user experience for all its features.

### What devices is Tire Sizes compatible with?

Tire Sizes is a universal app, meaning it can be installed on iPhone, iPad, and iPod Touch devices.

### How often is Tire Sizes updated?

The latest version of Tire Sizes is 2.0, which was last updated on May 3, 2017. Users can contact the developer for suggestions or support.

### What kind of unit conversions does Tire Sizes offer?

Tire Sizes supports conversions for measurements like millimeters and inches, and pressure units such as psi, kPa, Bar, and kg/cm².

### Can Tire Sizes help me understand my tire's sidewall information?

Yes, Tire Sizes includes a glossary with a tire sidewall diagram and detailed information derived from tire codes, explaining specifications like load index and speed rating.

### What is the age rating for Tire Sizes?

Tire Sizes has an age rating of 4+, making it suitable for a wide range of users.

### How accurate are the calculations in Tire Sizes?

The app allows users to choose alternative increments for calculations, such as 1 psi, 2 psi, 5 psi, or 10 psi, and the table defaults to the largest increment available for accuracy.

## Version history (last 2 releases)

### 2.0 — 2017-05-03

This app has been updated by Apple to display the Apple Watch app icon.

- 64-bit compatibility added to allow app to function on future versions of iOS.
- Updated UI for devices with 4.7 inch, 5.5 inch, and 12.9 inch screens.
- Brightened up the UI with color

### 1.0 — 2013-11-23

No release notes.

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All apps by Chewy Applications: https://appshunter.io/developer/415417492

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*