Cadillac SRX Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-9087647) - 2016 - crc - 5/4/15Vehicle Care 295Warning (Continued)tires not recommended for thosewheels are selected. Thisincreases the chance of a crashand serious injury. Only use GMspecific wheel and tire systemsdeveloped for the vehicle, andhave them properly installed by aGM certified technician.See Buying New Tires 0 293 andAccessories and Modifications0 240.Uniform Tire QualityGradingThe following information relatesto the system developed by theUnited States National HighwayTraffic Safety Administration(NHTSA), which grades tires bytreadwear, traction, andtemperature performance. Thisapplies only to vehicles sold inthe United States. The gradesare molded on the sidewalls ofmost passenger car tires. TheUniform Tire Quality Grading(UTQG) system does not applyto deep tread, winter tires,compact spare tires, tires withnominal rim diameters of10 to 12 inches (25 to 30 cm),or to some limited-productiontires.While the tires available onGeneral Motors passenger carsand light trucks may vary withrespect to these grades, theymust also conform to federalsafety requirements andadditional General Motors TirePerformance Criteria (TPC)standards.Quality grades can be foundwhere applicable on the tiresidewall between tread shoulderand maximum section width. Forexample:Treadwear 200 Traction AATemperature AAll Passenger Car Tires MustConform to Federal SafetyRequirements In Addition ToThese Grades.TreadwearThe treadwear grade is acomparative rating based on thewear rate of the tire when testedunder controlled conditions on aspecified government testcourse. For example, a tiregraded 150 would wear one andone-half (1½) times as well onthe government course as a tiregraded 100. The relativeperformance of tires dependsupon the actual conditions oftheir use, however, and maydepart significantly from thenorm due to variations in drivinghabits, service practices anddifferences in roadcharacteristics and climate.
