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The Toyota Opa (Japanese: トヨタ・Opa (オーパ), Hepburn: Toyota Ōpa) is a compact car produced by Toyota.Its name derives from the exclamation for surprise in Portuguese.
In the United States, the Office of Vehicle Safety Compliance, a component of the Department of Transportation, is one of the agencies tasked to enforce the Federal Motor Vehicle Safety Standard (FMVSS). [3] Canada has published tire regulations, such as the Motor Vehicle Tire Safety Regulations SOR 95-148. [4] Metric tire code example
Toyo Tire Corporation (TOYO TIRE （ トーヨータイヤ ） 株式会社, TŌYŌ TAIYA Kabushiki-gaisha), commonly known as Toyo Tires, is a multinational tire and rubber products company based in Itami, Japan. The company owns and operates eight factories in Asia, North America, and Europe and distributes tires and automotive components ...
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 as approximately 5–15% of the fuel consumed by a typical gas car may be used to overcome rolling resistance. [1]
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. The UTQG was created by the National Highway Traffic Safety Administration in 1978, a branch of the United States Department of Transportation (DOT). [ 1 ]
As the tire rotates under the weight of the vehicle, it experiences repeated cycles of deformation and recovery, and it dissipates the hysteresis energy loss as heat. Hysteresis is the main cause of energy loss associated with rolling resistance and is attributed to the viscoelastic characteristics of the rubber.
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