1. What is Tire Equivalent Size?

Tire equivalent size refers to tires that have matching diameter and width measurements, ensuring proper fitment and performance. Equivalent sizes can be used as alternatives when the exact original tire size is not available.

2. How Does the Calculator Work?

The calculator matches tires based on:

Where:

• Diameter — Overall tire diameter in inches
• Width — Tire width in inches

Explanation: The calculator finds tires with matching diameter and width dimensions to ensure proper fitment and performance.

3. Importance of Tire Size Matching

Details: Proper tire size matching is crucial for vehicle safety, handling, speedometer accuracy, and preventing damage to drivetrain components.

4. Using the Calculator

Tips: Enter the diameter and width in inches of your current tires to find equivalent sizes. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How close do tire sizes need to be to be equivalent?
A: Diameter should be within 3% of original, and width should match exactly or be within manufacturer specifications.

Q2: Can I use a different aspect ratio if width and diameter match?
A: Yes, as long as the overall diameter remains the same, different aspect ratios can be used with corresponding width adjustments.

Q3: Why is tire diameter important?
A: Diameter affects speedometer accuracy, gear ratios, and clearance in wheel wells.

Q4: What about load index and speed rating?
A: Equivalent size tires must meet or exceed the original tire's load index and speed rating.

Q5: Can I mix different equivalent sizes on my vehicle?
A: It's recommended to keep all four tires the same size, except for certain AWD/4WD vehicles which may require exact matches.