1. What is a Tyre Size Comparison Calculator?

Definition: This calculator compares two tyre sizes to show diameter and circumference differences in millimeters.

Purpose: Helps drivers and mechanics understand how changing tyre sizes will affect their vehicle's performance, speedometer accuracy, and clearance.

2. How Does the Calculator Work?

The calculator uses these formulas:

Where:

• Width — Tyre width in millimeters (e.g., 205)
• Aspect Ratio — Sidewall height as percentage of width (e.g., 55)
• Rim Diameter — Wheel diameter in inches (e.g., 16)

3. Importance of Tyre Size Comparison

Details: Comparing tyre sizes helps ensure proper fitment, maintains speedometer accuracy, and prevents rubbing or clearance issues.

4. Using the Calculator

Tips: Enter both tyre sizes in the format Width/AspectRatio/RimDiameter (e.g., 205/55R16). All values must be within typical ranges.

5. Frequently Asked Questions (FAQ)

Q1: What's considered a significant difference in tyre size?
A: Differences greater than 3% may affect speedometer accuracy and vehicle handling.

Q2: Will larger tyres improve my fuel economy?
A: Not necessarily. While larger tyres may reduce engine RPM at speed, they also increase weight and rolling resistance.

Q3: How does tyre width affect performance?
A: Wider tyres typically provide better grip but may increase road noise and fuel consumption.

Q4: Can I use this calculator for winter tyres?
A: Yes, the calculator works for all tyre types as long as you input the correct size specifications.

Q5: Why does rim diameter use inches while width uses mm?
A: This is the standard convention in the tyre industry for displaying tyre sizes.