Black plate (49,1)Cadillac DTS Owner Manual - 2011Tire Sidewall LabelingUseful information about a tire is molded into itssidewall.Passenger Car Tire Example(A) Tire Size : The tire size is a combination ofletters and numbers used to define a particulartire's width, height, aspect ratio, construction typeand service description. See the “Tire Size”illustration later in this section for more detail.(B) TPC Spec (Tire Performance CriteriaSpecification) : Original equipment tires designedto GM's specific tire performance criteria have aTPC specification code molded onto the sidewall.GM's TPC specifications meet or exceed allfederal safety guidelines.(C) DOT (Department of Transportation) : TheDepartment of Transportation (DOT) codeindicates that the tire is in compliance with theU.S. Department of Transportation Motor VehicleSafety Standards.(D) Tire Identification Number (TIN) : The lettersand numbers following the DOT code are the TireIdentification Number (TIN). The TIN shows themanufacturer and plant code, tire size, and datethe tire was manufactured. The TIN is moldedonto both sides of the tire, although only one sidemay have the date of manufacture.(E) Tire Ply Material : The type of cord andnumber of plies in the sidewall and under thetread.(F) Uniform Tire Quality Grading (UTQG) : Tiremanufacturers are required to grade tires basedon three performance factors: treadwear, tractionand temperature resistance. For more informationsee Uniform Tire Quality Grading on page 6‑70.6-49
