The inner eight refers to the fact that the two front wheels will be seriously worn from the driving direction to the center line of the axle, which is normal and parallel, which is different from the usual saying that toe angle toe angle is inward in the vertical direction. This is normal, and the inner eight is abnormal. "
The way of wheel driving is similar to the way of human walking. When you think your foot is flat, it is not. Most of your body weight falls behind the outside of the heel, which causes the heel in that part to wear very quickly. Similarly, if it seems that the tire is vertical to the ground, the tire tread wear cannot be uniform due to the interaction between the weight pressure of the vehicle itself and the friction generated by ground walking. Therefore, it is necessary to calculate the optimal suspension geometry according to the design of vehicle suspension system, so that the front wheel has a camber angle. After such camber, although the tire does not look perpendicular to the ground, it can indeed make a tread when the vehicle really walks.