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  • Tire code

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    Automobile tires are described by an alphanumeric tire code (in American English and Canadian English) or tyre code (in British English, Australian English and others), which is generally molded (or moulded) into the sidewall of the tire. This code specifies the dimensions of the tire, and some of its key limitations, such as load-bearing ability, and maximum speed. Sometimes the inner sidewall contains information not included on the outer sidewall, and vice versa. The code has grown in complexity over the years, as is evident from the mix of SI and imperial units, and ad-hoc extensions to lettering and numbering schemes. New automotive tires frequently have ratings for traction, treadwear, and temperature resistance (collectively known as The Uniform Tire Quality Grade (UTQG) ratings). Most tires sizes are given using the ISO Metric sizing system. However, some pickup trucks and SUVs use the Light Truck Numeric or Light Truck High Flotation system.

  • Low rolling resistance tire

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    Low rolling resistance tires are designed to reduce the energy loss as a tire rolls, decreasing the required rolling effort — and in the case of automotive applications, improving vehicle fuel efficiency. Approximately 5–15% of the fuel consumed by a typical car may be used to overcome rolling resistance. A 2003 California Energy Commission (CEC) preliminary study estimated that adoption of low-rolling resistance tires could save 1.5–4.5% of all gasoline consumption, but that current data were also insufficient to compare safety and other characteristics. A United States National Highway Traffic Safety Administration (NHTSA) study in 2009 found that if 2% of the replacement tires would reduce their rolling resistance by 5%, there would be 7.9 million gallons fuel and 76,000 metric tons of CO2 saved annually. (SAE J1269 and SAE J2452) performed on new tires.

  • Firestone and Ford tire controversy

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    The Firestone and Ford tire controversy was a period of unusually high failures of P235/75R15 ATX, ATX II, and Wilderness AT tires installed on the Ford Explorer and other related vehicles. The tire failures are linked to 271 fatalities and over eight hundred injuries in the United States with more injuries and fatalities occurring internationally, it led Bridgestone/Firestone and Ford Motor Company to recall and replace 23 million tires, it cut the market value of Bridgestone/Firestone in half, Firestone closed the Decatur, Illinois factory where the tires were manufactured, several executives in Bridgestone and Ford resigned or were fired, it led Congress to pass the TREAD Act, and it brought an end to the nearly 100 year corporate relationship between Ford Motor Company and Firestone.

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