[python] Re: BB-seat diff vs. PSI
- From: Dirk Bonné <dirk.bonne@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Thu, 05 Apr 2012 12:00:32 +0200
Wheelflop and PSI are very different. PSI happens when going straight
(pivot turning angle near to zero), and wheel flop happens at greater
turning angle values. At zero degrees turning angle the weight cannot be
pulling the front part sideways.
The stokid python has a smaller pivot angle (57.5degrees) against
60degrees of the pythoon. These 2.5degrees difference give an amazing
difference in wheel flop. But wheel flop is not all bad: I can turn
shorter at slower speed (=no lean) with the stokid. When I tried out the
pythoon with a pivot angle of 70 and 80degrees the self rise was so big
I wasn't able to do a reasonable non-leaning turn.
For me PSI has a lot to do with:
* riding with or without click pedals
* how used you are to the bike
On 05.04.2012 08:00, Jürgen Mages wrote:
> I also noticed, that high (> 25 cm) BBs have negative influence on
> steering stability. My theory: Wheelflop is increased through higher
> CoG of the front part (BB+cranks+Pedals are quite heavy).
>
> Jürgen.
>
> On 05.04.2012 07:03, Vi Vuong wrote:
>> Anybody notices effect of BB-seat diff on PSI? or perhaps BB height
>> alone? BB-seat diff in the survey ranges from 1 to 32cm, plus crank.
>> It seems that kicking the pedal upward causes more PSI then pushing
>> forward or downward. Ref: http://en.openbike.org/wiki/BB-Seat_Diff.
>>
>> Vi
>
>
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