Uniform tire quality grading standards

This information indicates the relative performance of passenger car tires in the area of treadwear, traction, and temperature resistance.

This is to aid the consumer in making an informed choice in the purchase of tires.

Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width. For example:

Treadwear 200 Traction AA Temperature A

The quality grades apply to new pneumatic tires for use on passenger cars. However, they do not apply to deep tread, winter type snow tires, space-saver or temporary use spare tires, tires with nominal rim diameters of 12 inches or less, or to some limited production tires.

All passenger car tires must conform to Federal Safety Requirements in addition to these grades.

See also:

Head restraint adjustment
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Other markings
The following makings are also placed on the sidewall. Maximum permissible inflation pressure The maximum cold inflation pressure to which this tire may be inflated. For example, “350 kPa (51 PSI) ...

If no steam is coming from the engine compartment
NOTE For details about how to check the coolant level or how to add coolant, refer to “Engine coolant” F11-17. 1. Keep the engine running at idling speed. 2. Open the hood to ventilate the engine ...