> these points line up as if they were two ends of a long headset. Thanks Mark, now I have got it. So both pivots have the same axis. The construction is similar to Greg K's trikes. http://www.adventuresofgreg.com/hpventry.html > The angle is REALLY laid back, more than 45degrees. Is the trail negative or positive? Jürgen. ============================================================ This is the Python Mailinglist at freelists.org Listmaster: Juergen Mages jmages@xxxxxx ============================================================