(E) Tire Inflation: The temporary use tire or compactspare tire should be inflated to 60 psi (420 kPa).For more information on tire pressure and inflationsee Inflation - Tire Pressure on page 5-66.(F) Tire Size: A combination of letters and numbersdefine a tire’s width, height, aspect ratio, constructiontype and service description. The letter “T” as thefirst character in the tire size means the tire is fortemporary use only.(G) Tire Performance Criteria Specification(TPC Spec): Original equipment tires designed toGM’s specific tire performance criteria have aTPC specification code molded onto the sidewall.GM’s TPC specifications meet or exceed all federalsafety guidelines.Tire SizeThe following illustration shows an example of a typicalpassenger car tire size.(A) P-Metric Tire: The United States version of ametric tire sizing system. The letter “P” as thefirst character in the tire size means a passengervehicle tire engineered to standards set by the U. S.Tire and Rim Association.(B) Tire Width: The three-digit number indicates thetire section width in millimeters from sidewall to sidewall.5-62
