Different Size Tires and WheelsIf you add wheels or tires that are a different sizethan your original equipment wheels and tires, thismay affect 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,traction control, and electronic stability control, theperformance of these systems can be affected.{CAUTION:If you add different sized wheels, yourvehicle may not provide an acceptable levelof performance and safety if tires notrecommended for those wheels are selected.You may increase the chance that you willcrash and suffer serious injury. Only useGM specific wheel and tire systems developedfor your vehicle, and have them properlyinstalled by a GM certified technician.See Buying New Tires on page 5-73 and Accessoriesand Modifications on page 5-3 for additional information.Uniform Tire Quality GradingQuality grades can be found where applicable on thetire sidewall between tread shoulder and maximumsection width. For example:Treadwear 200 Traction AA Temperature AThe following information relates to the systemdeveloped by the United States National HighwayTraffic Safety Administration (NHTSA), whichgrades tires by treadwear, traction, and temperatureperformance. This applies only to vehicles sold inthe United States. The grades are molded on thesidewalls of most passenger car tires. The UniformTire Quality Grading (UTQG) system does not applyto deep tread, winter-type snow tires, space-saver,or temporary use spare tires, tires with nominalrim diameters of 10 to 12 inches (25 to 30 cm), orto some limited-production tires.While the tires available on General Motors passengercars and light trucks may vary with respect to thesegrades, they must also conform to federal safetyrequirements and additional General Motors TirePerformance Criteria (TPC) standards.5-75
