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2. Tire maintenance - Wikipedia

   en.wikipedia.org/wiki/Tire_maintenance

   Tire maintenance for motor vehicles is based on several factors. The chief reason for tire replacement is friction from moving contact with road surfaces, causing the tread on the outer perimeter of tires to eventually wear away. When the tread depth becomes too shallow, like for example below 3.2 mm (4/32 in), the tire is worn out and should ...

3. Uniform Tire Quality Grading - Wikipedia

   en.wikipedia.org/wiki/Uniform_Tire_Quality_Grading

   UTQG ratings on sidewall of Toyo Tires Proxes R39 tire UTQG ratings (top) and tire code (bottom) on sidewall of Continental ContiProContact tire. Uniform Tire Quality Grading, commonly abbreviated as UTQG, is a set of standards for passenger car tires that measures a tire's treadwear, temperature resistance and traction.

4. Tire code - Wikipedia

   en.wikipedia.org/wiki/Tire_code

   The European Tyre and Rim Technical Organisation (ETRTO) and the Tire and Rim Association (TRA), formerly known as The Tire and Rim Association of America, Inc., [1] are two organizations that influence national tire standards. There exists also the Japan Automobile Tyre Manufacturers' Association, Inc. (JATMA).

5. Radial tire - Wikipedia

   en.wikipedia.org/wiki/Radial_tire

   The first radial tire designs were patented in 1914 by G. H. Hamilton and T. Sloper -patent № 467 filed in London, [3] and in 1916 by Arthur W. Savage, a tire manufacturer (1915–1919), firearm designer and inventor in San Diego, CA - U.S. patent 1,203,910.

6. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   This number will vary depending on the number of lugs, the PCD, the material used and the type of axle the wheel is used on. A wheel used on a free rolling trailer axle will carry more weight than that same wheel used on the drive or steering axle of a vehicle. All wheels will have the load capacity stamped on the back of the wheel.

7. Goodyear Tire and Rubber Company - Wikipedia

   en.wikipedia.org/wiki/Goodyear_Tire_and_Rubber...

   According to Goodyear and EPA officials "the fuel-efficient line-haul tires deliver up to 4% improved truck fuel economy, and when used with other SmartWay-qualified components, each 18- wheel tractor and trailer used in long-haul can produce savings of up to 4,000 gallons per year, or more than $11,000 annually."