Prefix Letters used by the Tire and Rim Association in Tire Size Designations and Their Definitions
Posted by Trailer Wheels on 2/4/2012 to
Trailer Tires FAQ
PREFIX LETTERS USED BY THE TIRE AND RIM ASSOCIATION
IN TIRE SIZE DESIGNATIONS AND THEIR DEFINITIONS
Prefix letters are included, when necessary, as part of Tire Size
Designations to differentiate between tires designed for service
conditions whichIN TIRE SIZE DESIGNATIONS AND THEIR DEFINITIONS
may require different loads and inflations and/or tires designed for, and which must be used on, different types of rims.