On-Vehicle Service

There are two ways to correct tires which cause a vibration even though they are properly balanced. One method uses an automatic machine which loads the tire and buffs small amounts of rubber from the stiff spots on the outer two tread rows. Correction by this method is usually permanent and, if done properly, does not significantly affect the appearance or tire tread life. Tire truing for free runout with a blade-type machine is not recommended as this reduces the tread life substantially and often does not permanently correct the problem. Another method is to dismount the tire and rotate it 180° on the rim. It is important that this be done only on tires and wheels which are known to be causing a vibration as it is just as likely to cause good tires and wheels to vibrate.