Tire size is a code on the side of a tire that tells you its width, sidewall height, and the wheel size it fits.

Load Index on a tire indicates the maximum weight it can support when properly inflated/mounted.

The Speed Rating on a tire is a letter code that shows the top speed it can safely handle when properly inflated/mounted.

The sidewall is the section of the tire extending from the tread down to the bead. It provides lateral stability.

Numeric / Alpha Numeric code designated by the Tire Manufacturer.

The "ply," is structure of layers that provides the tire's strength and structure.