1. What is Tire and Wheel Offset?

Tire offset is the distance between the wheel's mounting surface and the centerline of the wheel/tire assembly. It affects vehicle handling, suspension geometry, and wheel clearance.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Wheel Offset — Distance from wheel centerline to mounting surface (mm)
• Tire Sidewall Adjustment — Difference caused by tire width (mm)

Explanation: The total offset is the combination of the wheel's inherent offset and any adjustment caused by the tire's sidewall characteristics.

3. Importance of Correct Offset

Details: Proper offset ensures correct wheel positioning, prevents rubbing against suspension components, maintains proper scrub radius, and preserves vehicle handling characteristics.

4. Using the Calculator

Tips: Enter wheel offset (typically stamped on the wheel) and tire sidewall adjustment (consult tire specifications). Both values should be in millimeters.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between positive and negative offset?
A: Positive offset means the mounting surface is toward the outside face of the wheel. Negative offset means it's toward the inside (brake side).

Q2: How does offset affect my vehicle?
A: Incorrect offset can cause poor handling, accelerated bearing wear, tire rubbing, or interference with suspension components.

Q3: What is a typical wheel offset range?
A: Most passenger vehicles use +35mm to +45mm offset. Trucks and SUVs often have lower positive offsets.

Q4: Can I use this calculator for wheel spacers?
A: Yes, wheel spacers effectively change your wheel offset. Add spacer thickness to your wheel offset in the calculation.

Q5: How precise do these measurements need to be?
A: Even small changes (5mm) can make a difference. Always verify clearances when changing wheel/tire combinations.