Different Size Tires and WheelsIf you add wheels or tires that are a different size thanyour original equipment wheels and tires, this couldaffect the way your vehicle performs, including itsbraking, ride and handling characteristics, stability,and resistance to rollover. Additionally, if your vehiclehas electronic systems such as anti-lock brakes, rolloverairbags, traction control, and electronic stability control,the performance of these systems can be affected.{ CAUTION:If you add different sized wheels, your vehicle maynot provide an acceptable level of performance andsafety if tires not recommended for those wheelsare selected. You may increase the chance that youwill crash and suffer serious injury. Only use GMspecific wheel and tire systems developed for yourvehicle, and have them properly installed by a GMcertified technician.See Buying New Tires on page 6-71 and Accessoriesand Modifications on page 6-3 for additional information.Uniform Tire Quality GradingQuality grades can be found where applicable onthe tire sidewall between tread shoulder andmaximum section width. For example:Treadwear 200 Traction AATemperature AThe following information relates to the systemdeveloped by the United States National HighwayTraffic Safety Administration (NHTSA), whichgrades tires by treadwear, traction, andtemperature performance. This applies only tovehicles sold in the United States. The grades aremolded on the sidewalls of most passenger cartires. The Uniform Tire Quality Grading (UTQG)system does not apply to deep tread, winter-typesnow tires, space-saver, or temporary use sparetires, tires with nominal rim diameters of10 to 12 inches (25 to 30 cm), or to somelimited-production tires.While the tires available on General Motorspassenger cars and light trucks may vary withrespect to these grades, they must also conformto federal safety requirements and additionalGeneral Motors Tire Performance Criteria (TPC)standards.6-73
