I-109

An identifier of a particular tire line and size combination assigned by the tire manufacturer.

The highest inflation pressure (measured in pounds of force per square inch, PSI) the tire is designed to contain, and should only be used when called for by the vehicle placard

Measured in 32nds of an inch, this metric shows how much tread life is left on a tire, with the tire's traction & stopping capabilities greatly diminished at 4/32nds and less. Tire manufacturers include "tire wear bars" at 2/32nds to indicate when your tire is worn out

The range of widths the rim of the vehicle can be for this tire to be safely mounted on

The measurement of width from a tires inner sidewall to the outer sidewall

The diameter of a tire that is inflated without any load applied