Department Of Transportation Uniform Tire Quality Grades

The following tire grading categories were established by the National Highway Traffic Safety Administration. The specific grade rating assigned by the tire’s manufacturer in each category is shown on the sidewall of the tires on your vehicle.

All passenger car tires must conform to Federal safety requirements in addition to these grades.

See also:

Vehicle Modifications/Alterations
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Fuel System Cautions
CAUTION! Follow these guidelines to maintain your vehicle’s performance: • The use of leaded gasoline is prohibited by Federal law. Using leaded gasoline can impair engine performance, and dam ...

Driving Up Hill
Once you have determined your ability to proceed and have shifted into the appropriate gear, line your vehicle up for the straightest possible run. Accelerate with an easy constant throttle and ap ...