1. What is Wheel Offset?

Wheel offset is the distance between the wheel's mounting surface and its centerline. It's a crucial measurement that affects vehicle handling, tire wear, and suspension geometry.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Old Offset — Original wheel offset in millimeters (can be positive, negative, or zero)
• Spacer Thickness — Thickness of the wheel spacer being added in millimeters

Explanation: Adding a wheel spacer effectively changes the wheel offset by pushing the wheel outward from the hub.

3. Importance of Correct Wheel Offset

Details: Proper wheel offset ensures correct wheel positioning within the wheel well, prevents rubbing against suspension components, and maintains proper scrub radius for optimal handling.

4. Using the Calculator

Tips: Enter your current wheel offset and the thickness of the spacer you plan to add. Both values should be in millimeters. Positive offset means the mounting surface is toward the outside face of the wheel, negative offset means it's toward the inside.

5. Frequently Asked Questions (FAQ)

Q1: What's considered a "safe" wheel offset change?
A: Generally, staying within ±5mm of factory offset is safe, but consult your vehicle's specifications as tolerances vary.

Q2: How does offset affect my vehicle?
A: Increased negative offset (wheel pushed outward) may improve stability but can cause rubbing. Positive offset (wheel pulled inward) may reduce turning radius but affect handling.

Q3: Do I need longer wheel studs with spacers?
A: Typically needed for spacers over 5mm thick. Hub-centric spacers are recommended for better fitment.

Q4: Can I use this calculator for negative spacers?
A: Yes, just enter a negative spacer thickness to calculate reduced offset.

Q5: Where can I find my current wheel offset?
A: Usually stamped on the back of the wheel, marked as "ET" followed by a number (e.g., ET45 means 45mm positive offset).