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Tire and Wheel Inspection

Tire and Wheel Inspection



The tires on all new production models have a tire performance criteria (TPC) rating number molded on the sidewall. The TPC rating will appear as a 4-digit number preceded by the letters TPC SPEC on the tire wall near the tire size. A replacement tire should have the same TPC rating.


Tire Wear



(1) Hard Cornering/Underinflation


(2) Incorrect Alignment/Lack of Rotation


(3) Incorrect Alignment/Non-uniform Tire


(4) Heavy Acceleration/Over inflation


(5) Wear Indicator


Inspect the tire and wheel assemblies for the following conditions:


• Unusual wear such as cupping, flat spots, and/or heel-and-toe wear

These conditions can cause tire growl, tire howl, slapping noises, and/or vibrations throughout the vehicle.

• Proper inflation to specifications for the vehicle

• Bulges in the sidewalls

Do not confuse bulges, which are an abnormal condition, with normal ply splices which are commonly seen as indentations in the sidewall.

• Bent rim flanges