[python] Re: wheel flop vs pedaling induced steering
- From: Kevin Bailey <ke-python@xxxxxxxxxxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Wed, 28 Nov 2007 07:50:57 -0800
On Wed, Nov 28, 2007 at 01:52:39PM +0100, J?rgen Mages wrote:
>
> The PSI is dependant of the position of the steering pivot relatively to
> the riders hip joints (at least in my theory). If the steering axis goes
> right through the center between the riders hips then PSI is minimized. You
> will find this at all center-steered bikes. See pictures on my
> modifications page.
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.
I have not gone through that page of various bicycle profiles
to see if the theory holds up.
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