The tire diameter, or rim diameter code, is located on the sidewall of the tire, after the “R”, according to the Ford Owner website. Many tire retailers and manufacturers offer online search features that allow users to search for the right SUV tire by size, including Dunlop, Michelin and Uniroyal.
A vehicle’s tire size can also be found in the owner’s manual or on the tire label, according to Uniroyal. Depending on the vehicle, the tire label might be located on the glove box lid, driver’s side doorjamb or inside the fuel hatch. Most mid-size and full-size SUVs have a tire diameter of 16, says TheTireStore.com, an online tire retailer.