owners manual Tesla S

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Wheels and Tires acceleration, cornering, hydroplaning or Uniform Tire Quality Grading peak traction characteristics. The following information relates to the tire grading system developed by the NationalTemperature Highway Traffic Safety Administration (NHTSA), which grades tires by tread wear,The temperature grades are A (the highest), traction and temperature performance. TiresB, and C, representing the tires resistance to that have deep tread, and winter tires, arethe generation of heat and its ability to exempt from these marking requirements.dissipate heat when tested under controlled Where applicable, quality grades are found onconditions on a specified indoor laboratory the tires sidewall between the tread shouldertest wheel. Sustained high temperature can and maximum section width. For example:cause the tire to degenerate and reduce tire life, and excessive temperature can lead to • TREADWEAR 180 sudden tire failure. • TRACTION AA The grade C corresponds to the minimum • TEMPERATURE A level of performance that all passenger car The quality grades are described next.tires must meet under the Federal Motor Safety Standard No. 109. Grades B and A Note: In addition to the marking requirements,represent levels of performance on the passenger car tires must conform to Federallaboratory test wheel that exceed the Safety Requirements. minimum requirements. Treadwear Warning: A tires temperature grade is established for a tire that is properly The treadwear grade is a comparative ratinginflated and not overloaded. Excessive based on the wear rate of the tire when testedspeed, under-inflation, or excessive under controlled conditions on a specifiedloading, either separately or in government test course. combination, can cause heat buildup and For example, a tire graded 150 wears one andpossible tire failure. a half times better on a government test course than a tire graded 100. The relative performance of tires depends on the actual conditions of their use, however, and can depart significantly from the norm due to variations in driving habits, service practices, road characteristics, and climate. Traction The traction grades, from highest to lowest, are: AA, A, B, and C. These grades represent a tires ability to stop on wet pavement as measured under controlled conditions on test surfaces of asphalt and concrete. A tire marked C might have poor traction performance. Warning: Defective tires are dangerous. Do not drive if a tire is damaged, excessively worn, or is inflated to an incorrect pressure. The safety of the vehicle and occupants can be adversely affected. Check tires regularly for wear and to ensure there are no cuts, bulges or exposure of the ply/cord structure. Warning: The traction grade assigned to the tire is based on straight-ahead braking tests, and doesnt include: Specifications 147

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