[python] Re: trail vs wheelsize


On 7 okt 2006, at 20.28, Jürgen Mages wrote:

On 07.10.2006 09:55, Dennis Budding wrote:

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) 

The steering behaviour is surely influenced by the wheelsize.
Bigger wheels make the front part heavier and this counteracts
the centering effect.


I find both Dirk's and Lennart's pythons more heavy-steered and sluggish than monty, but that could have other reasons than wheel size.



Also small wheel python riders report
downhill coasting speeds of 60 kph and above while bigwheelers
have their limit around 50 kph.


I have no computer on monty, but going downhill at around 40 kph I start imagining about ambulances, nurses and cruches. The bike feels not safe.



But as there are too few experienced riders around who can try
different pythons there is no scientific basis for a good theory
yet.

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

If you shorten the wheelbase more weight shifts to the front part



Then why do people say that with longer wheelbase you get less wheel slip? What piece of the puzzle have I lost?



resulting in less centering effect - I think.

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 

Keep us in the loop Dennis, the Netherlands should be a perfect
hunting ground for pythons ...



Ach, hilltops are so beautiful ...


Olaf




Jürgen.
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