Enter both sizes
Choose the width, profile, and rim for the tire on the car and the tire you are considering.
Vortex Games · App support
Tire Size
Comparison
Clear answers for comparing tire geometry on your iPhone—without an account, subscription, or support maze.
Email supportQuick help
Start with the essentials
Read the difference
The result compares diameter, sidewall, circumference, ground-clearance change, and speedometer effect.
Check with a fitter
The app compares geometry. It cannot confirm load rating, wheel offset, brake clearance, or vehicle approval.
Common questions
Useful before you write
Why can two different sizes look close?
A wider tire can use a lower profile and a larger rim while keeping its overall diameter near the original. The result screen shows the actual geometry instead of relying on the size label alone.
Does the app guarantee fitment?
No. Tire and wheel fitment also depends on specifications the app does not measure. Confirm the vehicle placard and handbook, then ask a qualified tire professional.
Does it need a connection or sign-in?
No. Calculations run on the device. There is no account and no sign-in.
What should I include in a support email?
Describe what you expected and what happened. If helpful, attach a screenshot and include your iPhone model and system version. Please do not send private or financial information.
Contact
A person will read it.
Send product questions, accessibility feedback, or bug reports by email. No login is required.