Tires (Front) - Irregular Wear
90chevy14Number: 91-26-3E
Section: 3E
Date: June 1990
Corp. Bulletin No: 053501
Subject: FRONT TIRE WEAR
Model and Year: 1982-91 LIGHT DUTY TRUCKS (REAR WHEEL DRIVE)
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 91-12-3E. THE KILOMETERS HAVE BEEN TRANSLATED INTO MILES. ALL COPIES OF 91-12-3E SHOULD BE DISCARDED.
Rear wheel drive trucks, equipped with All Season and/or On-Off road tires may exhibit irregular wear of; the front tires. Small amounts of irregular wear is considered normal and is not necessarily a result of incorrect alignment. Incorrect alignment (especially toe) may result in premature wear of the front tires, however agressive 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 6,000 miles for Schedule 1 or 7,500 miles for Schedule 2 and then every 15,000 miles thereafter.
NOTE: Earlier rotation may be required should irregular wear pafterns develop due to harsh service use - the following rotation patterns are recommended for the various vehicle types and tire combinations.