1. What is the Tire Size Equivalent Calculator?

The Tire Size Equivalent Calculator calculates the equivalent tire size based on diameter, width, and aspect ratio. This helps in comparing different tire sizes and finding suitable alternatives for vehicle tires.

2. How Does the Calculator Work?

The calculator uses the tire size equivalent formula:

Where:

• \( Diameter \) — Wheel diameter in inches
• \( Width \) — Tire width in millimeters
• \( Aspect \) — Aspect ratio percentage

Calculation: The equivalent size is calculated by converting the wheel diameter to millimeters and adding twice the sidewall height (width × aspect ratio ÷ 100).

3. Importance of Tire Size Calculation

Details: Calculating equivalent tire sizes is crucial for maintaining proper vehicle performance, ensuring accurate speedometer readings, and finding compatible replacement tires.

4. Using the Calculator

Tips: Enter the wheel diameter in inches, tire width in millimeters, and aspect ratio as a percentage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why calculate equivalent tire size?
A: It helps find alternative tire sizes that maintain similar overall diameter for proper vehicle function and accurate speedometer readings.

Q2: What is aspect ratio?
A: Aspect ratio is the height of the tire's cross-section as a percentage of its width.

Q3: How much can tire size vary?
A: Generally, tire diameter should not vary more than 3% from the original equipment size for proper vehicle operation.

Q4: Does equivalent size guarantee compatibility?
A: No, other factors like load rating, speed rating, and clearance must also be considered when changing tire sizes.

Q5: Can I use this for plus-sizing wheels?
A: Yes, this calculator can help determine appropriate tire sizes when changing to larger diameter wheels while maintaining overall diameter.