Close view of a performance car wheel and tire

Tire LabField notes

Guides · 1 article

The details that make a fit make sense.

Plain-language guides to tire sizes, markings, seasons, and wheels. Start with the numbers on your own sidewall.

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1 guide.

Close view of a performance car wheel and tire

Fitment guide8 min readHow to read every number on your tireWidth, aspect ratio, load, speed, and the four-digit code that tells you how old a tire really is. Here is what every mark on the sidewall means.Read the guideSeptember 15, 2026