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GM Tire Performance Criteria (TPC) Tires installed as original equipment (OE) on new GM vehicles for North America meet stringent performance requirements according to the Tire Performance Criteria (TPC) system. Nearly all OE tires have the TPC Specification Number (TPC Spec.NO.) molded onto their sidewall. This TPC number will identify tires that meet GM's strict engineering requirements for areas such as ride, handling, endurance, traction, noise, wear, uniformity and dimensions. When new tires are needed, GM strongly recommends replacing OE tires with replacement tires that have the same TPC Spec number. The TPC system will help to assure that the "right" tire is selected for a particular vehicle model. This means that the tires are specifically matched for the vehicle to provide consistent ride and handling for the life of the vehicle. If the TPC Spec replacement tires are not available, make sure the replacement tires selected are the same size, load range, speed rating, and construction type as the OE TPC Spec tires.
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