(B) Tire Ply Material: The type of cord andnumber of plies in the sidewall and underthe tread.(C) Tire Identification Number (TIN): The lettersand numbers following the DOT (Department ofTransportation) code is the Tire IdentificationNumber (TIN). The TIN shows the manufacturerand plant code, tire size, and date the tirewas manufactured. The TIN is molded onto bothsides of the tire, although only one side mayhave the date of manufacture.(D) Maximum Cold Inflation Load Limit:Maximum load that can be carried and themaximum pressure needed to support that load.(E) Tire Inflation: The temporary use tire orcompact spare tire should be inflated to 60 psi(420 kPa). For more information on tire pressureand inflation see Inflation - Tire Pressure onpage 5-67.(F) Tire Size : A combination of letters andnumbers define a tire’s width, height, aspect ratio,construction type, and service description. Theletter T as the first character in the tire size meansthe tire is for temporary use only.(G) TPC Spec (Tire Performance CriteriaSpecification): Original equipment tires designedto GM’s specific tire performance criteria havea TPC specification code molded onto the sidewall.GM’s TPC specifications meet or exceed allfederal safety guidelines.Tire SizeThe following illustration shows an example of atypical passenger vehicle tire size.(A) Passenger (P-Metric) Tire: The United Statesversion of a metric tire sizing system. The letterP as the first character in the tire size meansa passenger vehicle tire engineered to standardsset by the U.S. Tire and Rim Association.(B) Tire Width: The three-digit number indicatesthe tire section width in millimeters from sidewallto sidewall.5-63
