Tire Size Comparison calculator

When upgrading your vehicle’s tires or replacing worn-out ones, understanding tire size differences is crucial. A new tire size can affect your car’s performance, fuel efficiency, and even your speedometer’s accuracy.

At TireSize Calculator. We’ve built a free Tire Size to help you compare two tire sizes instantly.

Tire Size Comparison Calculator

Tire Size Calculator

Stock Tire Size

New Tire Size

 

Why Compare Tire Sizes?

Tire sizes, like 205/55R16 or 225/50R17, aren’t just numbers—they determine how your vehicle handles, rides, and performs. Here’s why comparing tire sizes is important:

  • Performance: Larger or wider tires can improve grip but may affect acceleration or fuel economy.

  • Speedometer Accuracy: A different tire diameter changes how far your car travels per wheel rotation, skewing your speedometer.

  • Safety: Incorrect tire sizes can impact braking, suspension, or clearance.

  • Aesthetics: Upgrading to larger wheels often enhances your car’s look but requires the right tire size to fit.

Our calculator compares your stock tire size to a new one, showing differences in diameter, width, sidewall height, circumference, and more. This helps you make informed decisions before buying new tires.

How to Use Our Tire Size Comparison Calculator

Our tool, inspired by industry-leading designs, is simple and intuitive. Here’s how to use it:

  1. Enter Stock Tire Size:

    • Width (mm): The tire’s width, e.g., 205 for a 205/55R16 tire.

    • Aspect Ratio (%): The sidewall height as a percentage of width, e.g., 55.

    • Rim Diameter (in): The wheel size, e.g., 16.

  2. Enter New Tire Size:

    • Input the same fields for the new tire, e.g., 225/50R17.

  3. Click Calculate:

    • Our calculator processes the inputs and displays a table with:

      • Diameter (in): Total tire height.

      • Width (in): Tire width.

      • Sidewall (in): Sidewall height.

      • Circumference (in): Distance around the tire.

      • Revs per Mile: Wheel rotations per mile.

      • Speedometer Difference: Actual speed vs. displayed speed (e.g., at 60 mph).

    • A bar chart visualizes the diameter difference.

  4. Review Results:

    • See side-by-side metrics and differences to understand the impact of the new tire size.

Example: Comparing 205/55R16 vs. 225/50R17

Let’s say your car has stock tires of 205/55R16, and you’re considering 225/50R17. Using our calculator:

  • Stock (205/55R16):

    • Diameter: ~24.9 inches

    • Width: ~8.1 inches

    • Sidewall: ~4.4 inches

    • Circumference: ~78.3 inches

    • Revs per Mile: ~811

  • New (225/50R17):

    • Diameter: ~25.9 inches

    • Width: ~8.9 inches

    • Sidewall: ~4.4 inches

    • Circumference: ~81.4 inches

    • Revs per Mile: ~781

  • Differences:

    • Diameter: +1.0 inch (new tire is taller)

    • Speedometer: At 60 mph displayed, actual speed is ~62.4 mph

The bar chart shows the diameter difference visually, helping you see if the new size fits your vehicle’s clearance or aesthetic goals.

Understanding the Metrics

Here’s what each metric means:

  • Diameter: The total height of the tire. A larger diameter may improve handling but could rub against your car’s fenders.

  • Width: Wider tires offer better traction but may increase fuel consumption.

  • Sidewall: Lower aspect ratios (shorter sidewalls) give a sportier ride but may feel stiffer.

  • Circumference: Affects how far the tire travels per rotation, impacting speedometer accuracy.

  • Revs per Mile: Fewer revolutions mean a larger tire, which can slow acceleration.

  • Speedometer Difference: A larger tire makes your car travel faster than the speedometer shows, which can affect speeding tickets or fuel economy calculations.

Benefits of Using Our Calculator

  • Quick and Free: Get instant results without cost.

  • Accurate: Precise calculations based on standard tire formulas.

  • Visual: The bar chart makes diameter differences easy to understand.

  • Mobile-Friendly: Use it on your phone while shopping for tires.

  • Informed Decisions: Avoid costly mistakes by checking compatibility before buying.

Tips for Choosing the Right Tire Size

  • Check Your Vehicle Manual: Ensure the new size fits your car’s specifications.

  • Consider Driving Conditions: Wider tires suit dry roads; narrower ones may be better for snow.

  • Consult a Professional: If unsure, ask a mechanic to verify clearance and compatibility.

  • Balance Looks and Performance: Larger wheels look great but may reduce ride comfort.