1993 GMC Safari Owner's Manual - Page 283

A Poorlymaintainedandimproperlyusedtiresaredangerous. Overloadingyourtirescancauseoverheatingasaresult of too muchfriction. You could haveanair-outandaseriousaccident. See"Loading Your Vehicle'' in the Index. Underinflated tires posethesamedangerasoverloadedtires. Theresultingaccident could causeseriousinjury.Checkalltires frequently to maintaintherecommendedpressure.Tirepressure shouldbecheckedwhenthetiresarecold. Overinflatedtiresaremorelikely bysuddenimpact(aswhenyou recommendedpressure. to be cut,punctured, orbroken hit apothole).Keeptiresatthe Worn, old tirescancauseaccidents. If yourtreadisbadlyworn, or if yourtireshavebeendamaged,replacethem. Don'tdriveover 85 mph (135 km/h)even if it'slegal,unlessyou havethecorrect high speedratedtires. Inflation-Tire Pressure The Certificationrrire labelwhichisontherearedge of thedriver's door showsthecorrectinflationpressures for yourtires,whenthey'recold."Cold" meansyourvehiclehasbeen sitting foratleastthreehoursordrivenno morethanamile. 6-45