[python] trail vs wheelsize

Hi
on the frame geometry part of the python site is written, "the negative trail 
has a positive effect on the selfcentering capabilities of the python. the 
greater the negative trail the better"
on the project survey part of the site is see that largewheel bikes have large 
negative trails and smallwheel bikes have small negative trails. of course I 
see that the pivot angle of nearly all smallwheel bikes is smaller than the 
bigwheel bikes, I can also imagine that the larger trail is partly caused by 
the larger wheelsize
but my question is 

when I make a python with the data of for example P3, same trail, same pivot 
angle and same wheelbase but with 18 inch wheels can I expect a bike with the 
same riding behaviour or wil it be completely different.
(so has the wheelsize also something to do with the steeringbehaviour)

when I shorten the wheelbase and keep all other specs the same does that 
influence the self centering effect or only the turningcircle.

I'm planning the 18inch bike based on the bike on the foto, only adding a 
second front fork and an optima bike seat.
because my weldingskills are a little bit less than zero I'll have to find 
someone to weld it for me.
hopefully this month

more info soon to come

regards Dennis


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