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Ackermann, as well as alignment, can be checked using a quality laser system or simply by using a string. For Ackermann, string out about 10 feet from the tire sidewalls with the wheels pointed straight ahead. Make a mark for the left and right wheel. Then turn the wheels about the same as when the car goes around the turns. Make another set of marks. There should be a difference of less than 11/42 inch between the two sets, with the left more than the right.