2007 Suzuki Reno Owner's Manual - Page 174

SERVICE AND APPEARANCE CARE tire's sidewall is 70% as high as it is wide. D. Construction Code A letter code is used to indicate the type of ply construction in the tire. The letter "R" means radial ply construction, the letter "D" means diagonal or bias ply construction; and the letter "B" means belted-bias ply construction. E. Rim Diameter Diameter of the wheel in inches. F. Service Description These characters represent the load range and the speed rating of a tire. The load range represents the load carrying capacity a tire is certified to carry. The speed rating is the maximum speed a tire is certified to carry a load. Speed ratings range from "A" to "Z". Glossary of Tire Terminology Air Pressure: The amount of air inside the tire pressing outward on each square inch of the tire. Air pressure is expressed in pounds per square inch (psi) or kilopascal (kPa). Accessory Weight: This means the combined weight of optional accessories. Some examples of optional accessories are automatic transmission, power steering, power brakes, power windows, power seats, and air conditioning. Aspect Ratio: The relationship of a tire's height to its width. Belt: A rubber coated layer of cords that is located between the plies and the tread. Cords may be made from steel or other reinforcing materials. Bead: The tire bead contains steel wires wrapped by steel cords that hold the tire onto the rim. Bias Ply Tire: A pneumatic tire in which the plies are laid at alternate angles less than 90 degrees to the centerline of the tread. The following illustration shows an example of a typical passenger car tire size. A. Tire Type This letter code indicates the primary intended use of the tire. The "P" as the first character in the tire size means a passenger vehicle tire engineered to standards set by the U.S. Tire and Rim Association. B. Tire Width The three-digit number indicates the tire section width in millimeters from sidewall to sidewall. C. Aspect Ratio A two-digit number that indicates the tire height-to-width measurements. For example, if the tire size aspect ratio is "70", as shown in item "C" of the illustration, it would mean that the 5-30