Tire Sizes - % Differences in Tire & Wheel 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.

更新履歴
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