OneSize DoesNotFit All (NAPSA)—As a driver’s ulti- How To Tell mate connection to the road, tires need to be regularly inspected and properly maintained or replaced to preserve their performance and handling characteristics. According to the experts at the Car Care Council, during a recent National Car Care month, 21 percent of the vehicles inspected in check lanes had improperly inflated tires and 16 percent had worn tread and neededreplacing. “Consumers need to be choosy when purchasing new tires and replace them with the manufacturer’s specified tires for their vehicle, because when it comes to tires, one size does not fit all,” said Dave Cowger, engineering group manager of the Tire-Wheel Systems Lab at General Motors. GM’s Tire-Wheel Systems Laboratory puts North Americandesigned tire-wheel assemblies through stringent tests to ensure they meet or exceed internal, federal and Society of Automotive Engineerscriteria. GM’s tire and wheel engineers develop exclusive Tire Performance Criteria (TPC) specifications for each vehicle engineered in North America. This helps ensure tire performance, handling and durability under a variety of driving conditions. Major tire manufacturer engineers work together with GM’s tire and wheel engineers during the validation process. Only those select tires approved through GM’s TPC process are stamped with a TPC spec number, so customers can go to a dealership or a nationaltire brand retail store and order a new tire specifically engineered to go with a GM-specific vehicle. A technician checks a tire tread for wear during a multipoint vehicle inspection. “Tires are an engineering mar- vel, with 20 individual compounds and components designed to provide the customer with an optimum blend of performance and durability,” said Cowger. “Replacing your tires with anything besides the original equipment Tire Performance Criteria-specified tire can impact many performanceaspects of a vehicle, including braking, steering, cornering, ride and handling, noise and vibration, traction and even fuel economy.” Basic Tire Maintenance Tips A few simple tire maintenance steps can help identify and address problems before needing replacement: Check for uneven wear or excessive tread wear. Make sureall tires, including the spare, are properly inflated. Inflate tires to recommendedpressure. Underinflated tires can reduce fuel economy by up to 3.8 percent, according to the U.S. Department of Energy. Properly rotate tires at recommendedintervals. Properly align and balance wheels. If You Need NewTires Tire wear depends on several factors, including driving style and tire maintenance habits. One way to know when to replacetires is when tread-wear indicators appear. A tire’s built-in tread-wear indicators are “wear bars” that look like narrow strips of smooth rubber across the tread and appear when it’s time to replacethetire. Anewtire is neededif: The indicators at three or more places around the tire are visible. Cord or fabric is showing through the tire’s rubber. The tread or sidewall is cracked, cut or snagged deep enoughto show cord or fabric. The tire has a bulgeorsplit. The tire has a puncture, cut or other damage that can’t be repaired well because of the size or location of the damage. Buying New Tires To determine what kind and size of tire are needed, check the vehicle label. For GM vehicles engineered in North America, the tires installed on each new vehicle have a Tire Performance Criteria Specification (TPC Spec) number on eachtire’s sidewall. When purchasing new tires, get ones with that same TPC Spec numberto ensure the vehicle continues to have tires designed to give proper endurance, handling, speed rating, traction, ride and performance during normal service on the vehicle. If the tires have an all-season tread design, the TPC number will be followed by an “M+S” (for mud and snow). Learn More For more information, visit the GM Goodwrench Web site at www.goodwrench.com.
