[Russ Noble]

Jim,

Let me explain it this way. With a reverse "A" arm the toe in is fixed and controlled by a solid attachment at one point ie the inner pivot. If the wheel moves backwards and forwards in plan view it scribes an arc about that centre pivot. If it moves forward you get toein if it moves back you get toeout. When you go to twin paralell lower links although the points on the upright remain the same the toein is controlled by an additional pivot point on the chassis. So in plan view you have a paralellogram instead of a triangle to locate the upright and so get no change in the wheel alignment as it is displaced fore and aft. A picture's probably worth a thousand words, but unfortunately I don't have one.

Cheers