[python] Re: Japan
- From: Olaf Johansson <noll@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Mon, 5 Dec 2005 16:58:10 +0100
On 5 dec 2005, at 15.15, Jürgen Mages wrote:
Jürgen, I don't think it will be this low when finished.
His drawing shows 30 degrees, that´s better, though still
quite low for learning. On the other hand he seems to have
sufficient wacky-bike-experience (flevo and kalle) to learn
the python quickly.
Ok, I didn't see the drawing. Yes the combination of short wheel
base, high bb and low seat angle may well result in a hard-to-learn-
bike. But, as we all know, learning is half the fun.
Anybody out there who knows enough Japanese to find out the
name and mailadress of this Zen-master?
BTW Olaf, how is the usability of your BB-pivot?
Haven't used monty for a while now. I have no complaints on the
design or the build. To be honest, monty has mostly been used as an
abend bike (short meditative tour in the evenings). Only a few times
I have used it for longer distances. So it has not been up to any
real abuse. However, I have ridden monty on not so good roads with
holes, and over other minor obstacles such as curbs.
Only noticable drawback (bis jetzt) is the weight of the bb.
Parting functions well. It takes longer than to fold a Brompton but
that is ok with me. What has not yet been solved is that the parts do
not lie stable on top of each other. When I wrap the folded bike and
put it in the train, the rocking movements makes them fall apart.
Compared to building the bike this is an easy problem but it is still
to be solved. I guess some sort of holder sticking up from the seat
would do the trick.
The folded dimensions are small enough for my needs and I can even
take monty on the bus.
Takes it a lot effort to separate the Monty?
Is the construction stable enough or does it show wear?
I have looked carefully for cracks and bends but found none. In this
design it is very important that the bb-cassette rings are tightly
screwed into the bb-tube. The smallest play is well noticed while
riding, and will add strain to the weldings.
Also I believe life expectancy for this pivot solution is good
(provided you start with a fresh cassette). Contrary to other
solutions replacement is an easy task.
In order to make the pivot lighter one can shorten the pivot fork.
But then you have to shorten the bb axle of hardened steel and
perhaps also make new threads. All this seemed to much work at the
time so I opted for the easy way.
One can also explore the possibilities of bb:s with splined axles
like for instance ISIS.
)--O laf
Any info for my planned pivot-survey is welcome ;-)
Thanks,
Jürgen.
<Alt Psycle 1130594426.gif>
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