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ARTICLE - How do I read the information on the tire sidewall?

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One of the more common sidewall markings is metric. You might see sidewalls that look like the image above. 170/60ZR-17 or 170/60-17 72 ZR

Another sidewall marking pattern is alphabetical.

M T 90 – 17 Load Range B

Another sidewall marking pattern is in inches.

4.50 ZR 17 4PR