So Jurgen . . . The idea of the PX is to basically try to get the pivot more in line with the rider and sort of a line drawn down the center of their body and see what that does to stability? Also, what if you monted the seat onto the front of the bike and left the pivot where it is? Body steering would likely be problematic, but you could always add handle bars to the rear section. ============================================================ This is the Python Mailinglist at freelists.org Listmaster: Juergen Mages jmages@xxxxxx ============================================================