2011 Infiniti M Owner's Manual - Page 449

4. R: The "R" stands for radial. 5. Two-digit number (16): This number is SDI1575 SDI1606 Example Example 1 Tire size (example: P215/60R16 94H) 1. P: The "P" indicates the tire is de- the wheel or rim diameter in inches. 6. Two- or three-digit number (94): 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. H: Tire speed rating. You should not drive the vehicle faster than the tire speed rating. TIRE LABELING Federal law requires tire manufacturers to place standardized information on the sidewall of all tires. This information identifies and describes the fundamental characteristics of the tire and also provides the tire identification number (TIN) for safety standard certification. The TIN can be used to identify the tire in case of a recall. signed for passenger vehicles. (Not all tires have this information.) 2. Three-digit number (215): This number gives the width in millimeters of the tire from sidewall edge to sidewall edge. 3. Two-digit number (60): This number, known as the aspect ratio, gives the tire's ratio of height to width. 8-34 Maintenance and do-it-yourself