[python] Re: Svar: Re: New Python - 20" or 26"?

Ok right I didn't think about the inseam. There is a table at

   http://en.openbike.org/wiki/Wheel_Sizes
this states that 84cm is the minimum for 170mm cranks with 26" wheels. Now I am not sure which is right.
About the rolling resistance, I quote from the schwalbe website (english version)
"Rolling resistance is the energy that is lost when the tire is rolling and the main reason for loss of energy is the constant deformation of the tire." 
...
"Small diameter tires have a higher rolling resistance at the same tire pressure, because tire deformation is proportionally more important, in other words the tire is “less round”." 

There are other elements:

   http://www.schwalbetires.com/tech_info/rolling_resistance

dirk

Thomas Paul Jahn wrote:

Yes, 20" wheels fit shorter legs. I would not be able to use 26". When I remember well, 
the minimum inseam height was 86 cm with 26" according to Jürgen.

and hej Dirk,
why do you mention higher rolling resistance with 20" compared to 26"? Do you 
think, the axis will turn faster at the same speed and thereby increase resistance?
So what about the reduced air resistance with 20" then. That should be much more 
important. And the reduction in weight? And in particular for the python, with 20" 
wheels you reduce the distance between front axi and pivot, which I believe gives a lot 
of stability.
So even when I was 1,90 m, I would choose 20". Definitely!
By the way: why does Moulton have the world record on the upright bike. Not inspite 
of 17" wheels. Rather because of it.
cheers
Thomas


brian smith <briannsmith@xxxxxxxxxxxxx> 22-05-08 17:02 >>>
Is not leg length an important factor in deciding if one can use a 26" front wheel ? 
Just wondering
Oupa in SC USA

On Thursday, May 22, 2008, at 04:57  AM, dirk.bonne@xxxxxxx wrote:

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