1993 Pontiac Grand Prix Owner's Manual - Page 260

Warning: The temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire failure. Those gradesare molded on the sidewalls of passenger car tires. While the tires available as standard or optional equipmenton General Motors vehicles may vary with respect to these grades, allsuch tires meet General Motors performancestandards and have been approved for use General on Motors vehicles.All passenger type (P Metric) tires must conform to Federal safety requirementsin addition to these grades. Replace any wheel that is bent, cracked The wheels on your vehicle were aligned or badly rusted. If wheel nuts keep coming loose, the wheel, wheel bolts, and balanced carefully at thefactory to and wheel nuts should be replaced. If give youthe longest tire life and best the wheel leaks air out, replace it overall performance. (except some aluminum wheels, which In most cases, you willnot need to have can sometimes berepaired). See your your wheels alignedagain. However, if Pontiac dealer if any of these conditions you notice unusual tire wear or your exist. vehicle pulling one way or the other, the Your dealer willh o w the kind ~f wheel alignment may need be reset. If you to you need. notice your vehicle vibratingwhen driving on a smooth road, your wheels Each new wheel shouldhave the same may need to berebalanced. load carrying capacity,diameter, width, offset, and be mounted the same way as the oneit replaces. If you need to replace any of your wheels, wheel bolts, or wheel nuts, replace them only with new GM original equipment parts. This way, you will be sure to have the right wheel, wheel bolts, and wheel nuts for your Pontiac model. 259 Wheel AIignrnenf and Tire Balance Wheel Replacement