[python] Re: minq -- devious!

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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