2005 Ford Expedition Owner's Manual - Page 233

Tires, Wheels and Loading Information on "T" type tires "T" type tires have some additional information beyond those of "P" type tires; these differences are described below: T145/80D16 is an example of a tire size. Note: The temporary tire size for your vehicle may be different from this example. 1. T: Indicates a type of tire, designated by the Tire and Rim Association (T&RA), that is intended for temporary service on cars, SUVs, minivans and light trucks. 2. 145: Indicates the nominal width of the tire in millimeters from sidewall edge to sidewall edge. In general, the larger the number, the wider the tire. 3. 80: Indicates the aspect ratio which gives the tire's ratio of height to width. Numbers of 70 or lower indicate a short sidewall. 4. D: Indicates a "diagonal" type tire. R: Indicates a "radial" type tire. 5. 16: Indicates the wheel or rim diameter in inches. If you change your wheel size, you will have to purchase new tires to match the new wheel diameter. Location of the Safety Compliance Certification Label You will find a Safety Compliance Certification Label containing tire inflation pressure by tire size and other important information located on the B-Pillar or the edge of the driver's door. Refer to the payload description and graphic in the Vehicle loading - with and without a trailer section. 233 2005 Expedition (exd) Owners Guide (post-2002-fmt) USA (fus)