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Basic Tire Definitions

Ply Rating
An index of the tire's strength; ply rating indicates the maximum recommended load for a specific type of service. An index of the tire's strength; ply rating indicates the maximum recommended load for specific types of service. Ply rating normally does not indicate the number of plies or layers of rubber in the tire.
Load Range
Used to identify a tire's load and inflation limits when used in a specific type of service. Load Ranges are indicated by a letter (A,B,C etc.)
Bead Width
The distance between the vertical portions of the rim flange. If the rims is too wide or narrow, the tire will not seat properly. As a rule of thumb, bead widths should be 1/2" to 1-1/2" narrower than the section width of the tire to provide for a proper fit.
Section Width
The distance across the tire at its widest part when inflated but not under load.
Section Height
The distance between the top of the tire and the bead seat, when the tire is inflated but not under load
Overall Diameter
The distance from the top of the tire to the bottom, when the tires is inflated but not under load.