[python] Vedr.: Re: another newcomer

dirk.bonne@xxxxxxx 
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24-01-2007 14:14
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[python] Re: another newcomer






Henry Thomas wrote: 
dirk.bonne@xxxxxxx wrote: 
FYI: there has been documented measurements related to this. Check out 
this pdf: 

    http://www.ligfiets.net/redactie/meetligfietsengels.pdf 

Dirk 
Dirk, thanks for sharing this with us, it was a very interesting read. 
There isn't a lot of test data like this that I have found which is 
specifically dealing with recumbent. 

I am a bit confused about the tires. As I read it, larger rims (26") and 
firmer rubber compounds are better at higher pressures (110psi). However I 
thought that the Specialized Fat Boy was softer than the Schwalbe Stelvio 
Kevlar, or is that not the case. 


I read the opposite out of this paragraph and thus no contradiction. The 
supple rubber compounds are better. The stelvio material is stiffer and 
also has a worse performance. 

What I think is interesting is that extreme height differences between 
seat / BB are not needed. From 15 -> 25cm is no much different in power. 
So you can just as well use 15cms (more ergonomic). note, the measurement 
was made for seat angle of 21degrees.

Dirk

Well, I don't remember exactly where, but I read that given the SAME air 
pressure, a wider tire will deform less, as the weight is distributed over 
a larger area contact patch. The rubber itself does not account for much 
rolling resistance. However, usually the large rims are used with less 
pressure to obtain a smoother ride, better shock absorption or better grip 
for off-road uses.

Rasmus Møller

JPEG image

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