Hello, it is very interesting to read about the theoretical basis of the python again. Jürgen always recommends a steering angel around 67°. If I remember right the reason was, that a lower angel causes wheelflop and a steeper angel makes the bike unridable, because the selfcentering effect disappaers. In the projecct survey page are a lot of pythons with lower angels down to 60°. Is this possible, because the riders are so heavy or the front part is so light, that no wheelflop happens? Is the conclusion for me (1,74m tall, 70kg) to aim at a shallow steering angel for great selfcentering effect but a light front fame to avoid wheelflop? Is it right, that a bike with small wheels in general allows a lower steering angel because the COG of the front frame is not so high over the pivot point like on a bike with large wheels? In the weekend I cut out the complete front part of the front frame, changed it for the new crank, welded everything together again. Then had the first longer trip along the dyk about 15 km. I felt it easier to go a little bit uphill or against the wind than downhill or downwinds. In general get scared in higher speeds. Does this mean: no PSI problems, but not enough selfcentering effect? Or is it too early to make any conclusions? Your advices are welcome. Lutz > -----Ursprüngliche Nachricht----- > Von: python@xxxxxxxxxxxxx > Gesendet: 29.10.07 18:24:49 > An: python@xxxxxxxxxxxxx > Betreff: [python] Re: let us compare > > Thanks Dirk, > > very enlightening! > > A common problem in comparing pythons is that there is no standard > building plan. I was quite surprised how different even the four 26" > pythons were that I have tried. Despite their geometry was quite > similar, each felt different and it took me about 20 minutes till I got > used to them. No wonder that different wheel sizes have even more influence. > > > One difference with the flevo / python is the pedal induced steering. > > pedal induced steering is the slight wobble of the front bottom bracket > > in the cadence of pedalling. It was practically unnoticable on the flevo. > > It does amount to much on my python in terms of steering (I am guessing > > about 0.5degrees), but still I find it not very estetical. May be a 26" > > python has less PSI - my proficiency on Serges python was not good > > enough to judge that. > > I do not notice any PSI while riding, but I recall that when I switched > from python to airbike the latter felt less wobbly. The airbike always > gave me the impression like riding on rails. I guess, the flevo is > similar and I think the reason is the lower steering pivot angle of both > airbike and flevo: > > http://upload.wikimedia.org/wikipedia/de/5/50/Knicklenker.png > > Groetjes, > Jürgen. > ============================================================ > > This is the Python Mailinglist > > //www.freelists.org/list/python > > Listmaster: Jürgen Mages jmages@xxxxxx > > To unsubscribe send an empty mail to > python-request@xxxxxxxxxxxxx > with 'unsubscribe' in the subject field. > > ============================================================ > > _______________________________________________________________________ Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 3 Monate kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220 ============================================================ This is the Python Mailinglist //www.freelists.org/list/python Listmaster: Jürgen Mages jmages@xxxxxx To unsubscribe send an empty mail to python-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field. ============================================================