Tire Diameter Calculator

Tire Diameter Calculator — Calculate Tire Size Overall Diameter

Calculate the overall diameter of your tires with our comprehensive calculator. Determine exact tire dimensions based on width, aspect ratio, and wheel diameter for proper fitment and performance.

Step 1: Tire Specifications

Tire Width (mm)

Aspect Ratio (%)

45%

Wheel Diameter (inches)

17″

Understanding Tire Size

Tire size is expressed as width/aspect ratioRwheel diameter (e.g., 225/45R17). Aspect ratio is the sidewall height as a percentage of tire width.

Step 2: Comparison Tire (Optional)

Enable comparison with another tire size

Comparison Tire Width (mm)

Comparison Aspect Ratio (%)

40%

Comparison Wheel Diameter (inches)

18″

Show tire size comparison table

Show diameter visualization chart

Tire Diameter Formula

Diameter = (2 × (Tire Width × Aspect Ratio ÷ 100) ÷ 25.4) + Wheel Diameter. This calculates the overall tire diameter in inches.

Tire Diameter Results

Summary

Size Comparison

Visualization

Overall Tire Diameter

25.0″

225/45R17

Tire Width

225 mm

Aspect Ratio

45%

Wheel Diameter

17″

Sidewall Height

101.3 mm

Tire Size Comparison

Tire Size	Diameter	Circumference	Revs per Mile	Difference

Tire Diameter Visualization

Tire Size Formula

Diameter (inches) = (2 × (Width × Aspect Ratio ÷ 100) ÷ 25.4) + Wheel Diameter

To calculate tire diameter: Convert sidewall height from mm to inches (divide by 25.4), multiply by 2, then add wheel diameter.

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