[python] Re: minq -- devious!
- From: Dirk Bonné <dirk_bonne@xxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Mon, 16 Jan 2006 17:39:21 +0100
Christoph Falkner wrote:
>Hi again,
>
> "Dirk Bonné" <dirk_bonne@xxxxxxxxxx> schrieb:
>
> "Okay. I was thinking about the chain pulling the wheel sideways. I thought
> that the big handle bars were to counteract that."
>
>Sorry, I didn´t see this aspect. Chain must pull in direction or exactly
>parallel to the steering axis to have NO momentum around the steering axis. On
>the Bevo it does, on the Minq not.
>
> "Such a bike with understeering. The seat a lower. Foldability. Could be
> nice."
>
>Funny. That were exactly my thoughts when I saw the pictures ;-). But you are
>limited in BB and seat high: To have enough "chainstay"-length for clean
>shifting, BB couldn´t be lower than 63 cm with 20"-wheels or 58 cm with
>16"-wheels. If the distance between BB and seat high should´t be more than 25
>cm,minimum seat high ist 38 cm respective 33 cm. OK, still quite low.
>
>
General question, Are there guide lines for the minimum distance between
BB and derailleur?
> "I googled for BEVO, they used an extra roller to handle the stress on the
> derailleur."
>
>
>This roller seems to be a MUST, if you use a derailleur.
>
>
May be I am just imagine things, but looking more at the minq2 pic, they
might have a solution --without rollers!!!
If you have the rotation axis going very near to the end of the
derailleur (the lower roller), you minimize the stress on the
derailleur. In such a case the positon of the end of the derailleur
doesn't change much when you turn!
It is a compromise of course, as you will always have a distance of the
rotation axis to the tip of the derailleur, but may be they figured it
acceptable.
Dirk
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