Car Weight Balance

One of the preliminary steps in wheel alignment is to check the accuracy of attachment of the wheels to the vehicle. All ball joints, control arm bushings and steering links must be in good condition in order to properly align the wheels. The frame must be checked to see that it is not bent. The axles and wheels must be located properly in relation to the frame or body. This involves making a series of measurements to establish the parallel and right angle relationships between the frame and wheels. The most important part of this car weight balance relationship is a straight, undistorted frame. First, an accurate centerline must be established. Then, if straight lines are drawn through the center of both rear axles and both front spindle locations, they must be parallel to each other and form right angles with the centerline of the frame. Next, when the wheels are attached to the front spindles and rear axles, the rear wheels should be parallel to the centerline of the frame. Also, the front wheels in their straight ahead position should be parallel to this line. This is necessary so that each wheel will roll straight and true in relation to the frame centerline.