Department Of Transportation Uniform TireQuality 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:

Wind Buffeting
Wind buffeting can be described as the perception of pressure on the ears or a helicopter-type sound in the ears. Your vehicle may exhibit wind buffeting with the windows down, or the sunroof (if ...

Gear Ranges
DO NOT race the engine when shifting from PARK or NEUTRAL into another gear range. PARK This range supplements the parking brake by locking the transmission. The engine can be started in this rang ...

Engine codes - bodywork versions
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