Purpose And Scope

The purpose of this Recommended Practice (RP) is to provide inspection procedures for identifying potential circumferential ruptures, also known as "zipper ruptures" on truck and bus tires (Load Range "F" and higher) and light truck tires (Load Range "E" and lower) of steel cord radial construction. This RP is based-with permission- on Tire Information Service Bulletin "Inspection Procedures to Identify Potential Sidewall Zipper Ruptures in Steel Cord Radial Truck, Bus and Light Truck Tires," published by the U.S. Tire Manufacturers Association (USTMA), 1400 K Street, N.W. #900, Washington, D.C., 20005.