Tire Size Calculator

Compare tire sizes, calculate dimensions, and find the perfect tire replacement. Get accurate measurements including diameter, circumference, and speedometer differences.

Tire Size Input

Original Tire Size

Width (mm)

Aspect Ratio (%)

Rim (inches)

Example: 225/60R16

New Tire Size

Width (mm)

Aspect Ratio (%)

Rim (inches)

Example: 235/55R17

Comparison Results

Enter tire sizes above to see detailed comparison results

How to Use the Tire Size Calculator

Step-by-Step Instructions:

1 Find your current tire size on the tire sidewall (e.g., 225/60R16)
2 Enter the width (225), aspect ratio (60), and rim size (16) in the "Original Tire" section
3 Enter the new tire size you're considering in the "New Tire" section
4 Click "Calculate & Compare" to see detailed results

Understanding Tire Size Format:

225/60R16

225 = Tire width in millimeters

60 = Aspect ratio (sidewall height as % of width)

R = Radial construction

16 = Rim diameter in inches

About This Tire Size Calculator

What This Tool Does:

✓ Calculates tire diameter and circumference
✓ Shows speedometer difference between tire sizes
✓ Compares sidewall height and overall dimensions
✓ Helps find equivalent tire sizes
✓ Provides accurate measurements for vehicle modifications

Perfect For:

• Car enthusiasts planning upgrades
• Mechanics and tire professionals
• Vehicle owners replacing tires
• Anyone wanting to understand tire specifications