Use the following two methods to correct tires which cause a vibration, although the tires are balanced properly:

1. This method uses an automatic machine that loads the tire and buffs small amounts of rubber from high spots on the outer two tread rows.

•	Using this method in order to correct the tires is usually permanent. This method does not significantly affect the appearance or the tire tread life.

•	Do not true the tires with a blade-type machine. This reduces the tread life substantially, and this often does not permanently correct the problem.

2. The second method is to dismount the tire and rotate it 180 degrees on the rim. It is important that this is be done on the tire and wheel assemblies which are known to be causing a vibration, as it is just as likely to cause good assemblies to vibrate.