For 1990-2009 cars

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

An automatic machine that loads the tire and buffs small amounts of rubber from high spots on the outer two tread rows.

1. 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.
2. 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.