Support
Wheel Offset & Fitment Calculator
Email [email protected] with “Wheel Fitment” in the subject. Include your app version, iOS version, and the current/proposed dimensions needed to reproduce a calculation issue. Share screenshots only if you choose to.
Wheel width and rim diameter are entered in inches; ET offset and tire width are entered in millimeters; aspect ratio is a percentage. Result-unit preferences change how comparison distances are displayed.
A positive inner-clearance change means more room relative to the current setup; a negative change means the proposed setup moves closer to the suspension. This does not measure actual vehicle clearance.
To restore paid access, use Restore on the paywall with the Apple Account used for the lifetime purchase. Contact Apple for billing or refund requests. Restoring access does not restore deleted local records.
Calculations are estimates. Confirm real fit, clearance, and compatibility with a qualified professional before installation or driving.