Black plate (57,1)Cadillac SRX Owner Manual - 2011Vehicle Care 10-57(D) Maximum Cold InflationLoad Limit : Maximum loadthat can be carried and themaximum pressure neededto support that load.(E) Tire Inflation : Thetemporary use tire or compactspare tire should be inflatedto 420 kPa (60 psi). For moreinformation on tire pressure andinflation see Tire Pressure onpage 10‑61.(F) Tire Size : A combination ofletters and numbers define atire's width, height, aspect ratio,construction type, and servicedescription. The letter T as thefirst character in the tire sizemeans the tire is for temporaryuse only.(G) TPC Spec (TirePerformance CriteriaSpecification) : Originalequipment tires designed toGM's specific tire performancecriteria have a TPC specificationcode molded onto the sidewall.GM's TPC specifications meetor exceed all federal safetyguidelines.Tire DesignationsTire SizeThe following illustrationshows an example of a typicalpassenger vehicle tire size.(A) Passenger (P‐Metric) Tire :The United States version ofa metric tire sizing system. Theletter P as the first character inthe tire size means a passengervehicle tire engineered tostandards set by the U.S.Tire and Rim Association.(B) Tire Width : The three‐digitnumber indicates the tire sectionwidth in millimeters fromsidewall to sidewall.(C) Aspect Ratio : A two‐digitnumber that indicates the tireheight‐to‐width measurements.For example, if the tire sizeaspect ratio is 60, as shown initem C of the illustration, it wouldmean that the tire's sidewall is60 percent as high as it is wide.(D) Construction Code : Aletter code is used to indicatethe type of ply construction inthe tire. The letter R meansradial ply construction; theletter D means diagonal orbias ply construction; and theletter B means belted‐bias plyconstruction.
