[python] Re: wheel flop vs pedaling induced steering

On 28.11.2007 16:50, Kevin Bailey wrote:
> I had assumed that PSI was dependent on the ratio between the
> pedal "width" (distance from the center of the pedal to the
> centerline of the bike) and the BB to pivot distance. Basically,
> that PSI was caused by the sideways component of the pedaller's
> stroke (which attempts to turn the wheel) and corrected by the
> foward component of his stroke (which attempts to straighten the
> wheel.) This ratio is equivalent to that between the pedal width
> and the BB to pivot distance. Put plainly, the further back you
> move the pivot (without changing the pedal width), the less the
> PSI. I assumed this was why the Python was better in this
> respect than the Traylor/Cruzbike designs.

Hello Kevin,
I thought this too - until I built the PX.5, an experimental prototype where the pivot was moved 25 cm further back than the normal position: 

http://python-lowracer.de/pics/Python%20PX.5.jpg

PSI was clearly noticeable and the bike was hardly rideable.

Cheers,
Jürgen.
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