[python] Re: AW: Re: BB in lower Position
- From: Dirk Bonné <dirk.bonne@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Sun, 20 Aug 2006 20:41:34 +0200
Thorsten Borm wrote:
> Dirk wrote:
>
>> are you saying that on your own python the self centering is the most
>> dominant force, more then the weight on the pedals?
>>
>> I just did a little test: I sat on the bike, hands on the floor
>>
> keeping
>
>> the bike straight up, and feet resting on the pedals. Then I tried
>> turning the front part and see for which the turning angles I have to
>> use force to stay at that turning angle (i.e. where the self centering
>> is dominant).
>>
>> For quite a big range (I guess -15 -> +15degrees), self centering is
>>
> so,
>
>> that it does NOT come back to straight by its own. Rather it is
>> "neutral": it does not tend to go further in a bend but does not tend
>>
> to
>
>> go straight. Only further outward I need to use force to keep a that
>> angle.
>>
>
> Exactly that was the problem before I changed the position of my BB! I
> always had to hold the front wheel in the straight position by my feet.
> I just did the same test like you: Now the self centering force is
> dominant at all angles.
>
How can lowering a BB have effect on the force of self centering? This I
do not understand.
BTW, I like that there is not much of a self centering force, so I see
it not as a problem for me. In fact if I could, I would go down in self
centering effect.
> Do you think there might be an influence of the wheel size? In case of
> our 20" wheels the difference between BB and FWA is 8cm more than using
> a 26" wheel!
>
That the 26" python has a larger self centering is clear. It has all to
do with the larger trail. And of course if the trail is larger well the
FWA-BB will be smaller. So indirectly yes.
Dirk
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