1. What is Tire Aspect Ratio?

The aspect ratio of a tire is the height of the tire's sidewall expressed as a percentage of the tire's width. It's a crucial specification in tire sizing that affects handling, comfort, and performance.

2. How Does the Calculator Work?

The calculator uses the aspect ratio formula:

Where:

• \( \text{Aspect Ratio} \) — The sidewall height as percentage of tire width (e.g., 65 in 205/65R15)
• \( \text{Width} \) — Tire width in millimeters (e.g., 205 in 205/65R15)
• \( \text{Height} \) — Sidewall height in millimeters

Explanation: The formula converts the aspect ratio percentage into actual sidewall height by multiplying it with the tire width.

3. Importance of Aspect Ratio Calculation

Details: Knowing the actual sidewall height helps in understanding tire dimensions, comparing different tire sizes, and ensuring proper fitment on vehicles.

4. Using the Calculator

Tips: Enter the aspect ratio (as found on your tire sidewall, e.g., 65 for 205/65R15) and the tire width in millimeters. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find my tire's aspect ratio?
A: It's the number after the slash in your tire size (e.g., in 205/65R15, 65 is the aspect ratio).

Q2: What's a typical aspect ratio for passenger cars?
A: Most passenger cars use aspect ratios between 45 and 65, with 55-60 being very common.

Q3: How does aspect ratio affect driving?
A: Lower aspect ratios (shorter sidewalls) generally improve handling but reduce ride comfort. Higher ratios provide more cushioning but may feel less responsive.

Q4: Can I change my tire's aspect ratio?
A: You can within limits, but you must maintain the same overall tire diameter to avoid speedometer errors. Consult a tire professional before changing sizes.

Q5: Does aspect ratio affect fuel economy?
A: Indirectly - lower profile tires often have lower rolling resistance but may be paired with wider treads that increase resistance.