Figure3.25: Types of suspension systems
If the upper and lower A-arms are the same length, the wheel will remain at a right angle to the road when it goes over a bump, but it will move in slightly, narrowing the track (the distance between the front wheels). Steering will be impaired, and the tires will wear rapidly if the upper A-arm is shorter than the lower the wheel will tilt inward as it moves up. The track will not vary, steering accuracy will be improved, and tire wear will be reduced. If the car is leaning into a turn, the inward tilt of the wheel will keep the tire perpendicular.
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