How to measure tire and wheel size

Written by eric cedric
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How to measure tire and wheel size
Take the proper measurements to get replacements or repairs for your tires and wheels. (Hal Bergman/Photodisc/Getty Images)

Determining the size of wheels and tires on your vehicle requires several measurements. Lug and bolt hole pattern is crucial to sizing the wheel, while measuring the diameter and width of the tire is essential for the rubber. Auto tires are referred to in increments of millimetres.

Skill level:

Things you need

  • Tape measure

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  1. 1

    Looking straight at the centre of the auto wheel, count the number of bolt holes. Common bolt patterns are 3-, 4-, and 5-bolt systems. Place a tape measure at the end of one of the holes, then extend it out to the hole directly across from it. Take the measurement in millimetres and combine it with the bolt number (example: 24mm x 5).

  2. 2

    Wipe away any debris from the tire sidewall and inspect for a number code, such as 225/25, which in this case would be 225 millimetres in diameter and 25 millimetres wide. If the tire is too worn to see the tire size, use a tape measure.

  3. 3

    Place one end of the tape measure at one end of the tire and run the tape directly across to the other end of the tire to determine the tyre's diameter in millimetres.

  4. 4

    Place the end of the tape measure on the edge of the tire tread and stretch it to the opposite side of the tread to learn the width of the tire. Combine them to determine the tyre's measurement, such as 235/45.

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