Tire Size Calculator
Compare tire dimensions, diameter, width, sidewall height, and circumference between two tires. Useful for choosing proper tire replacements or upgrades.
Tire Comparison Results
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Original Diameter (in)
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New Diameter (in)
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Difference
| Measurement | Original | New | Difference |
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Speedometer Difference
When speedometer reads 60 mph, actual speed will be approximately - mph.
About Tire Size Calculator
The Tire Size Calculator helps you compare the dimensions of two different tires to understand how they might affect your vehicle's performance. This is particularly useful when considering tire replacements or upgrades.
How Tire Sizes Are Calculated
The calculator uses the following formulas to determine tire dimensions:
- Overall Diameter: (Section Width × Aspect Ratio × 2 ÷ 25.4) + Wheel Diameter
- Sidewall Height: Section Width × Aspect Ratio ÷ 100
- Circumference: Overall Diameter × π (3.1416)
- Revolutions per Mile: 63,360 ÷ Circumference
Understanding the Results
The calculator provides several key metrics:
- Overall Diameter: The total height of the tire from the ground to the top of the tread
- Section Width: The width of the tire from sidewall to sidewall in millimeters
- Sidewall Height: The height of the tire's sidewall from rim to tread
- Circumference: The distance the tire covers in one complete revolution
- Revolutions per Mile: How many times the tire rotates to cover one mile
Common Use Cases
The Tire Size Calculator is useful for many scenarios:
- Tire Replacement: Find tires with similar dimensions when your exact size is unavailable
- Performance Upgrades: Compare how different tire sizes might affect acceleration and handling
- Speedometer Calibration: Understand how different tire sizes affect speedometer readings
- Clearance Checking: Ensure new tires won't rub against wheel wells or suspension components
- Fuel Economy: Estimate how different tire sizes might impact fuel efficiency
Important Considerations
When changing tire sizes, keep in mind:
- Larger tires may improve ground clearance but can reduce acceleration
- Smaller tires may improve acceleration but can reduce top speed
- Wider tires may improve handling but can reduce fuel efficiency
- Significant diameter changes may require speedometer recalibration
- Always consult your vehicle manual or a professional before making changes