2004 Nissan Titan Owner's Manual - Page 279

WDI0395 (1) Tire size (example: P215/65R15 95H) 1. P: The P indicates the tire is designed for passenger vehicles. 2. Three-digit number: This number gives the width in millimeters of the tire from sidewall edge to sidewall edge. 3. Two-digit number: This number, known as the aspect ratio, gives the tire's ratio of height to width. 4. R: The R stands for radial. 5. Two-digit number: This number is the wheel or rim diameter in inches. 6. Two- or three-digit number: This number is the tire's load index. It is a measurement of how much weight each tire can support. You may not find this information on all tires because it is not required by law. 7. Tire speed rating. You should not drive the vehicle faster than the tire speed rating. Maintenance and do-it-yourself 8-33