Tires (Front) - Irregular Wear Information
90chevy14GMC NUMBER: 91-3E-08
GROUP: 3E Wheels and Tires
DATE: July, 1990
CORPORATE
NUMBER: 053501
SUBJECT: FRONT TIRE WEAR ON LIGHT DUTY TRUCKS
MODELS: 1982-1991 C, K, G, ,V R, S, T AND M TRUCKS
Rear wheel drive trucks equipped with All Season and/or On-Off road tires may exhibit irregular wear of the front tires. A small amount of irregular wear is considered normal and is not necessarily a result of incorret alignment. Incorrect alignment (especially toe) may result in premature wear of the front tires, however aggressive cornering may also have a similar effect. Drive axle tires are much less prone to irregular wear therefore they should not be considered for comparison of wear to non-drive axle tires.
The rate of irregular wear is also dependent upon the depth of tread. New tires are more prone to irregular wear, so it is essential that tires are rotated at the proper intervals to normalize the wear
Light Duty truck tire rotation recommendations are pictured on the following page.
Rotation Guidelines for Tires used on Light Duty Trucks:
Tires used on Pickups, Vans and Utility vehicles should be rotated at the first 6000 miles (10,000 km) for schedule 1 or 7500 miles (12,500 km) for schedule 2 and then every 15000 miles (25,000 km) thereafter
NOTE: Earlier rotation may be required should irregular wear patterns develop due to harsh service use - the following rotation patterns are recommended for the various vehicle types and tire combinations.