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Each trailer tire has a size branded to its sidewall. This size lists valuable information about your tire. The seven pieces of information that a tire size may contain are the following:
There are three conventions for writing tire sizes. Each method includes some or all of the information mentioned above.
The application type indicates what the tire is intended to be used for.
Note: When replacing trailer tires, we recommend using Special Trailer (ST) tires.
The section width refers to the distance from the widest point of a tire's outer sidewall to the widest point of its inner sidewall; this distance is measured once the tire is mounted on the wheel it is going to be used with.
Sidewall aspect ratio (or section height) is the ratio of the tire height and width that will tell you the tire's section height.
Internal construction refers to how a tire is made. The letters below indicate the possible internal constructions a tire can have.
Note: For everyday use, tires with different internal construction cannot be used together.
Wheel (or rim) diameter refers to the diameter of the wheel the tire is mounted on.
The load range indicates the horizontal and sidewall strength of a tire. It is represented by a letter within each tire size. Each load range letter correlates to a specific number of tire plies and a load pressure in psi units. Sometimes the load range is left off the tire size and is branded on the tire elsewhere.
The information below tells you the ply rating and load pressure (in psi units) for each load range for Special Trailer (ST) and Light-Truck (LT) service tires.
Note: The weight capacity at a certain unit of psi for each tire is branded on each tire. It may be listed under the tire size or somewhere else on the tire.
The service description includes the load index and speed rating. Only Passenger (P-metric) tire sizes include the service description.
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