how are tires measured

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TheISO system(which was formerly called the ETRTO system) measured tires in millimeters with the first number (e.g. 20) being the tire width and the second number (e.g. 559) being the bead seat diameter.

People also ask


  • What do the numbers mean on my tire size information?

  • The first number to appear in your tire size information is the width, in millimeters, of the correct tires for your vehicle: P225/70R16 91S. Tire width always refers to the measurement from one sidewall to another.

  • How do you measure tire tread size?

  • The measurement is given in millimeters, and all 4 tires must have the same width. For instance, if the first number is 225, the tire tread is 225 mm wide. Understand that the following 2-digit number is the aspect ratio.

  • How do you write the width of a car tire?

  • In most countries, the tire width is printed in millimeters or meters. The tire width number is usually printed directly following a capitalized P. If your tire width is 1.75 metres (69 in), for example, the width number will usually be written as P175.

  • Why is it important to get a tire’s measurements?

  • Getting a tire’s measurements is an important part of selecting good tires for a vehicle. If the tire’s measurement information is not printed along its sidewall, you may not know which measurements to take or why. If it is, you may not know how to read the sidewall numbers.

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