Tire Size Calculator
Tire Size Calculator
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Tire Size Calculator

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Tire Size Calculator

Original Tire Size

New Tire Size

Understanding Tire Sizes

Tire sizes are typically represented as three numbers, such as 225/45R17. Here’s what each part means:

  • 225 – The width of the tire in millimeters
  • 45 – The aspect ratio (sidewall height as percentage of width)
  • R17 – The rim diameter in inches

Diameter Difference: ${diameterDifference.toFixed(2)} inches (${diameterDifferencePercent.toFixed(2)}%)

Circumference Difference: ${circumferenceDifference.toFixed(2)} inches (${circumferenceDifferencePercent.toFixed(2)}%)

Speedometer Difference: When speedometer reads 60 mph, actual speed will be ${(60 * (1 + speedoDifference/100)).toFixed(2)} mph (${speedoDifference.toFixed(2)}% ${speedoDifference > 0 ? 'faster' : 'slower'})

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Everything You Need to Know About Tire Sizes and Conversions

Choosing the right tire size for your vehicle is crucial for safety, performance, and fuel efficiency. Our comprehensive tire size calculator helps you compare different tire dimensions and understand how changes will affect your driving experience.

Why Tire Size Matters

Tire size impacts several important aspects of your vehicle:

  • Speedometer Accuracy: Changing tire diameter affects how your speedometer reads. Larger tires make your speedometer read slower than actual speed, while smaller tires make it read faster.
  • Fuel Economy: Larger, heavier tires typically decrease fuel efficiency due to increased rolling resistance and weight.
  • Handling and Performance: Wider tires generally provide better grip but may affect steering response. Taller tires can raise your vehicle’s center of gravity.
  • Clearance Issues: Larger tires may rub against wheel wells or suspension components, especially when turning or going over bumps.

How to Use Our Tire Size Calculator

Our calculator makes comparing tire sizes simple:

  1. Enter your current tire size (found on your tire’s sidewall)
  2. Enter the new tire size you’re considering
  3. Click “Calculate” to see detailed comparisons

The results will show you the diameter difference, circumference difference, and how the change will affect your speedometer reading.

Common Tire Size Questions

Can I put different size tires on my car?
Most vehicles can accommodate slightly different tire sizes, but you should stay within 3% of the original diameter to avoid significant issues. Always consult your owner’s manual or a tire professional.

What does plus sizing mean?
Plus sizing means increasing wheel diameter while decreasing tire aspect ratio to maintain nearly the same overall diameter. For example, changing from 205/55R16 to 225/45R17.

How much can I increase my tire size?
The safe amount varies by vehicle. Generally, a 1-2 inch increase in diameter is acceptable for most trucks/SUVs, while passenger cars should stay within 1 inch.

Tire Size Terminology Explained

  • Section Width: The width of the tire in millimeters from sidewall to sidewall
  • Aspect Ratio: The height of the sidewall as a percentage of the section width
  • Rim Diameter: The diameter of the wheel the tire fits, measured in inches
  • Load Index: The maximum load capacity of the tire
  • Speed Rating: The maximum speed the tire can safely maintain

Tips for Choosing the Right Tire Size

  1. Always prioritize the manufacturer’s recommended sizes
  2. Consider your typical driving conditions (highway, off-road, etc.)
  3. Think about seasonal needs if you’re not using all-season tires
  4. Check for clearance issues with any size changes
  5. Consult with a tire professional if you’re unsure

Remember that while our tire size calculator provides valuable information, it’s always best to consult with a qualified tire professional before making significant changes to your vehicle’s tire setup.