Bernhard and Michael, sounds great, the idea with the virtual pivot that can emulate every steering geometry. But I have no idea how this might be realized. I understodd that there are two stationary bars in line with the front and rear part of the frame and that they are attached to them. Then both ends of these bars are linked with two horizontally moveable bars. But how does this make a steering pivot? Maybe I need more explanations or a drawing to fully understand this. Regards from Jürgen. ============================================================ This is the Python Mailinglist at freelists.org Listmaster: Juergen Mages jmages@xxxxxx ============================================================