•  To prevent shimmy, the lower arm and tie rod are arranged in parallel.

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•  By aligning the lower arm and tie rod in parallel, a change in toe-in, which is the cause of shimmy, does not occur.

•  The theory of why the tor-in change does not occur is that when force is applied to the tires form the front, they move backward, thus resulting in the rectangle (formed by the links) becoming a parallelogram configuration. As a result, the tires move in parallel to the inside and, although there is a slight change in the vehicle tread width, there is no change in tor-in.