Black plate (46,1)Cadillac CTS Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-6081492) - 2014 - CRC 2nd Edition - 11/18/1310-46 Vehicle Care(5) Rim Diameter : Diameter ofthe wheel in inches.(6) Service Description : Thesecharacters represent the loadindex and speed rating of thetire. The load index representsthe load carrying capacity a tireis certified to carry. The speedrating is the maximum speed atire is certified to carry a load.Tire Terminology andDefinitionsAir Pressure : The amount ofair inside the tire pressingoutward on each square inch ofthe tire. Air pressure isexpressed in kPa (kilopascal)or psi (pounds per square inch).Accessory Weight : Thecombined weight of optionalaccessories. Some examples ofoptional accessories areautomatic transmission, powerwindows, power seats, and airconditioning.Aspect Ratio : The relationshipof a tire's height to its width.Belt : A rubber coated layer ofcords between the plies and thetread. Cords may be made fromsteel or other reinforcingmaterials.Bead : The tire bead containssteel wires wrapped by steelcords that hold the tire ontothe rim.Bias Ply Tire : A pneumatic tirein which the plies are laid atalternate angles less than90 degrees to the centerline ofthe tread.Cold Tire Pressure : Theamount of air pressure in a tire,measured in kPa (kilopascal)or psi (pounds per square inch)before a tire has built up heatfrom driving. See Tire Pressureon page 10-48.Curb Weight : The weight of amotor vehicle with standard andoptional equipment including themaximum capacity of fuel, oil,and coolant, but withoutpassengers and cargo.DOT Markings : A code moldedinto the sidewall of a tiresignifying that the tire is incompliance with the U.S.Department of Transportation(DOT) Motor Vehicle SafetyStandards. The DOT codeincludes the Tire IdentificationNumber (TIN), an alphanumericdesignator which can alsoidentify the tire manufacturer,production plant, brand, anddate of production.GVWR : Gross Vehicle WeightRating. See Vehicle Load Limitson page 9-11.
