1. What is an Aspect Ratio Calculator for Tires?

Definition: This calculator determines the aspect ratio percentage of a tire based on its sidewall height and width.

Purpose: It helps vehicle owners, mechanics, and tire professionals understand tire specifications and make appropriate tire selections.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( AR \) — Aspect ratio (percentage)
• \( SH \) — Sidewall height (millimeters)
• \( TW \) — Tire width (millimeters)

Explanation: The sidewall height is divided by the tire width, then multiplied by 100 to convert to a percentage.

3. Importance of Tire Aspect Ratio

Details: The aspect ratio affects ride comfort, handling characteristics, and load capacity. Lower ratios typically mean better handling but a firmer ride.

4. Using the Calculator

Tips: Enter the sidewall height and tire width in millimeters. Both values must be > 0. The result shows the aspect ratio percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical aspect ratio for passenger cars?
A: Most passenger tires have aspect ratios between 45-75, with 55-65 being very common.

Q2: How does aspect ratio affect performance?
A: Lower aspect ratios (like 35-45) generally improve handling and steering response but may reduce ride comfort.

Q3: Where can I find my tire's sidewall height?
A: It's often not directly listed, but can be calculated from the tire size marking (e.g., in 205/55R16, 55 is the aspect ratio percentage).

Q4: Can I change my tire's aspect ratio?
A: Yes, but it's important to maintain the same overall tire diameter to avoid speedometer inaccuracies and other issues.

Q5: Does aspect ratio affect fuel economy?
A: Yes, lower aspect ratio tires typically have lower rolling resistance, which can improve fuel efficiency.