Automobile Tire Wheel Size Comparison and Conversion Calculator

Metric Standard - Car Truck SUV Motorcycle

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Description:

This calculator provides tire conversion details in both metric and standard units for a given tire. It allows the user to compare two different tires. In addition, it provides actual speed versus speedometer readings if the tire sizes are different. Note, it assumes the speedometer is calibrated to the original tire.

Calculation Instructions:

  1. Enter the tire details for the Original tire or Tire 1.
  2. Enter the tire details for the Upgrade tire or Tire 2.

Inputs/Outputs:

Parameter Unit Type Unit Used Description
tire width length inch (in) and millimeter (mm) The tires section width , tread width or overall width.
aspect ratio unitless none The sidewall height of the tire as a percentage of width. Also known as series and profile.
tire diameter length inch (in) and millimeter (mm) The diameter or radius of the tire.
tire circumference length inch (in) and millimeter (mm) The length traveled when the tire makes one revolution.
sidewall height length inch (in) and millimeter (mm) The section height or the distance from the rim to the edge of the tire.
The section height or the distance from the rim to the edge of the tire. n/a n/a The chart shows the actual speed of the original tire and upgrade tire if the speedometer has not been calibrated for the change in tire size.

Disclaimer:

Use this calculator at your own risk. This calculator may or may not be accurate or reliable. By using this calculator you acknowledge any reliance on this calculator shall be at your sole risk.

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