2008 Mazda RX-8 Owner's Manual - Page 338

Customer Information and Reporting Safety Defects Tire Information (U.S.A.) qInformation on Temporary Tires Please refer to the diagram below. 1. Temporary tires 2. Nominal width of tire in millimeters 3. Ratio of height to width (aspect ratio) 4. Diagonal 5. Rim diameter code 6. Load index&speed symbol T115/70D 16 90M is an example of a tire size and load index rating. Here is an explanation of the various components of that tire size and load index rating. Note that the tire size and load index rating may be different from the example. T Indicates a tire that may be installed on cars, SUVs, minivans and light trucks as designated by the Tire and Rim Association (T&RA). 115 "115" is the nominal width of the tire in millimeters. This three-digit number gives the width in millimeters of the tire from sidewall edge to sidewall edge. In general, the larger the number, the wider the tire. 9-22