1. What is a Rim and Tire Size Comparison Calculator?

Definition: This calculator determines the difference in diameter between two tire sizes.

Purpose: It helps vehicle owners and mechanics compare tire sizes when considering upgrades or replacements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Diff \) — Difference in tire diameters (inches)
• \( TD1 \) — Diameter of first tire (inches)
• \( TD2 \) — Diameter of second tire (inches)

Explanation: The simple subtraction shows how much larger or smaller one tire is compared to another.

3. Importance of Tire Size Comparison

Details: Proper tire size comparison ensures correct speedometer readings, maintains vehicle handling characteristics, and prevents clearance issues.

4. Using the Calculator

Tips: Enter both tire diameters in inches. Positive results mean TD1 is larger, negative means TD1 is smaller.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my tire diameter?
A: Calculate using: (Width * Aspect Ratio / 100 * 2 / 25.4) + Wheel Diameter

Q2: What's considered a significant difference?
A: Differences >3% may affect speedometer accuracy and vehicle performance.

Q3: Can I use this for metric tire sizes?
A: Yes, but convert all measurements to inches first.

Q4: Does this account for wheel width?
A: No, this only compares diameters. Wheel width affects tire shape but not diameter.

Q5: What if I get a negative result?
A: A negative difference means the second tire is larger than the first.