Originally Posted by BP SHADOW

I will prepare to be bombarded after I make this statement, but to be able to find a true instant center, you really need to have a lower arm that pivots, because you project the point in space of that lower pivot out to where it intersects the angle of the upper arm. In most instances you want the instant center outside the tire. The longer the instant center, the more stable, but less responsive the car will be. A kingpin front end moves vertically as opposed to swinging in an arc, so the million dollar question would be, does it have a true " roll center"