Different Size Tires and WheelsIf you add wheels or tires that are a different size thanyour original equipment wheels and tires, this may affectthe way your vehicle performs, including its braking, rideand handling characteristics, stability, and resistanceto rollover. Additionally, if your vehicle has electronicsystems such as, antilock brakes, traction control, andelectronic stability control, the performance of thesesystems can be affected.{ CAUTION:If you add different sized wheels, yourvehicle may not provide an acceptablelevel of performance and safety if tires notrecommended for those wheels are selected.You may increase the chance that you will crashand suffer serious injury. Only use GM specificwheel and tire systems developed for yourvehicle, and have them properly installedby a GM certified technician.See Buying New Tires on page 5-76 and Accessoriesand Modifications on page 5-4 for additional information.Uniform Tire Quality GradingQuality grades can be found where applicableon the tire sidewall between tread shoulderand maximum 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.5-78
