Tire Sidewall LabelingUseful information about a tire is molded into its sidewall.(A) Tire Size: The tire size is a combination of lettersand numbers used to define a particular tire’s width,height, aspect ratio, construction type and servicedescription. See the “Tire Size” illustration later in thissection for more detail.(B) TPC Spec (Tire Performance CriteriaSpecification): Original equipment tires designed toGM’s specific tire performance criteria have a TPCspecification code molded onto the sidewall. GM’s TPCspecifications meet or exceed all federal safetyguidelines.(C) DOT (Department of Transportation): TheDepartment of Transportation (DOT) code indicates thatthe tire is in compliance with the U.S. Department ofTransportation Motor Vehicle Safety 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 date the tirewas manufactured. The TIN is molded onto both sides ofthe tire, although only one side may have the date ofmanufacture.(E) Tire Ply Material: The type of cord and number ofplies in the sidewall and under the tread.(F) Uniform Tire Quality Grading (UTQG): Tiremanufacturers are required to grade tires based onthree performance factors: treadwear, traction andtemperature resistance. For more information seeUniform Tire Quality Grading on page 5-67.(G) Maximum Cold Inflation Load Limit: Maximumload that can be carried and the maximum pressureneeded to support that load. For information onrecommended tire pressure see Inflation - Tire Pressureon page 5-56 and Loading Your Vehicle on page 4-31.Passenger Car Tire Example5-50
