[python] Re: BB in lower Position

  • From: Jürgen Mages <jmages@xxxxxx>
  • To: python@xxxxxxxxxxxxx
  • Date: Tue, 15 Aug 2006 20:13:15 +0200

Thorsten Borm wrote:

Until today my experience with the 20"-Python was 330 km. I always
missed the really safety and relaxed feeling because I needed 1 meter of
the road for myself. I was always afraid of other traffic members at
narrow roads and speed above 20 km/h. My biggest trip was 38 km at one
day - but I was totally broken at the end.
Today I made a little test with the geometry of my 20"-Python. I changed
the BB from above of the frame tube to a position below of the tube
(-10cm) which you can see at the picture. I don't know why, but there is
a big progress:
Only little nervous Zig-zags, much more self centring effect, more
safety feeling at higher speed and a better view towards the road. Now
I'm able to drive nearly the line I want to. The position is still high
enough to keep pedalling at narrow turns. With best regards
Thorsten

Interesting info. Good that you did not gave up!

I guess that what happened to you was quite similar to my experience
with the PX.5 one year ago. I made the BB-EOS 8 cm longer to adjust
it to my length and suddenly the bike was no longer rideable for
me (before it was ok).

The gravity center of the front part became too dominant/high and
the wheel flop effect started to overpower the self centering.
Resulting that I felt like sitting on a seesaw with the front part
moving from one side to the other. After I made the steering angle
10 degrees steeper the bike was normal again.

Any geometry data of your bike available?

Hope your problems are solved now and you start to have fun...

Jürgen.
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