2004 Cadillac XLR Owner's Manual - Page 276

(D) Tire Identification Number (TIN): The letters and numbers following DOT code are the Tire Identification Number (TIN). The TIN shows the manufacturer and plant code, tire size, and date the tire was manufactured. The TIN is molded onto both sides of the tire, although only one side may have the date of manufacture. (E) Tire Ply Material: The type of cord and number of plies in the sidewall and under the tread. (F) Uniform Tire Quality Grading (UTQG): Tire manufacturers are required to grade tires based on three performance factors: treadwear, traction and temperature resistance. For more information see Uniform Tire Quality Grading on page 5-64. (G) Maximum Cold Inflation Load Limit: Maximum load that can be carried and the maximum pressure needed to support that load. For more information on recommended tire pressure see Inflation - Tire Pressure on page 5-57 and Loading Your Vehicle on page 4-32. Tire Size Codes The following illustration shows an example of a typical passenger car tire size. A. P-Metric Tire B. Tire Width C. Aspect Ratio D. Construction Code E. Rim Diameter F. Service Description 5-52