1. What is Tire and Wheel Fitment?

Tire and wheel fitment refers to the proper matching of tires and wheels to a vehicle, ensuring adequate clearance between components. Proper fitment is crucial for vehicle safety, performance, and preventing damage to suspension and body components.

2. How Does the Calculator Work?

The calculator uses the clearance formula:

Where:

• \( New\ Diameter \) — Diameter of the new wheel/tire setup (inches)
• \( Old\ Diameter \) — Diameter of the original wheel/tire setup (inches)

Explanation: This calculation determines the radial clearance difference between the new and original setups, helping ensure proper fitment within the wheel well.

3. Importance of Proper Fitment

Details: Correct tire and wheel fitment is essential for maintaining vehicle safety, handling characteristics, and preventing interference with suspension components, brake systems, and body panels. Improper fitment can lead to dangerous driving conditions and vehicle damage.

4. Using the Calculator

Tips: Enter both new and old diameter values in inches. Ensure measurements are accurate and represent the overall diameter of the wheel/tire combination. Positive clearance values indicate the new setup is larger, while negative values indicate it's smaller.

5. Frequently Asked Questions (FAQ)

Q1: What is considered acceptable clearance?
A: Generally, ±3% diameter difference is acceptable for most vehicles, but always consult your vehicle manufacturer's specifications.

Q2: Does this calculation account for width differences?
A: No, this calculation only considers diameter. Width, offset, and backspacing are separate important fitment factors.

Q3: How do I measure wheel/tire diameter accurately?
A: Measure from the ground to the top of the tire when properly inflated and under load, or calculate using tire size markings.

Q4: What other factors affect wheel fitment?
A: Wheel offset, backspacing, bolt pattern, center bore, and suspension modifications all play crucial roles in proper fitment.

Q5: Should I consult a professional for wheel fitment?
A: Yes, always consult with a qualified automotive professional when changing wheel and tire sizes to ensure safety and proper fitment.