[python] AW: Re: Thanks Chris! Any everyone else.
- From: Gerald<bepb@xxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Thu, 4 Apr 2013 22:51:33 +0200
Hi,
I am not sure a adjustable pivot is so hard to build. Could you not just cut
the frame just about an inch behind the pivot and weld in a real solid hinge?
One with two arms like from a barn door? If you place the axle a bit below the
tube and cut both arms a bit above the tube, just to allow holes to put a stout
screw through both sides? With the screw and four nuts, you should be able to
abjust the pivot. But better make sure its all solid.
On the other hand, people have tried different pivot angels, but in my
understanding the optimum result has almost ever been between some 60 and 65
degree.
Br
Gerald
-----Ursprüngliche Nachricht-----
Von: Tihamer Juhasz <balamber@xxxxxxxxx>
An: python@xxxxxxxxxxxxx
Gesendet: Mittwoch, 03. April 2013 07:53:21 GMT+00:00
Betreff: [python] Re: Thanks Chris! Any everyone else.
Hi Ivan,
A working adjustable pivot is technically very difficult to do in my
opinion. I tried to build a test bike with an adjustable pivot to test
different bike geometries but it tended to buckle all the time. I would
suggest that if you really need to change the bicycle geometry, instead of
an adjustable pivot add front and/or back suspensions with a pretty large
range of adjustment and use them to raise/lower the front and rear of the
bike. This way you change the pivot angle as well.
If anyone has a good idea/mechanism of an adjustable pivot with a +/- 15
degrees of range or even more please share it. Infinitely
adjustable/stepless adjustment preferred.
That's my two cents.
Tiha
On Wed, Apr 3, 2013 at 10:09 AM, Ivan van Hoof <zl3tiv@xxxxxxxxx> wrote:
> That sounds like one nice seat! Bending ply or snake ply, I will have to
> make my seat out that stuff. Any thoughts on the main pivot? I like the
> simple bottom crank design but I want a design that is simple looking,
> sleek and adjustable angle by a few degrees to account for other riders
> weights and lengths. Good to see the group is active, very quick replies
> from you guys is great!
> I have shown, told a few work mate and friends the web site and they are
> keen to see me finish my python and ride it.( and a few think am crazy.)
> How smooth is the ride of these bike with 700c or 26 inch wheel on the
> road( no off road) would I need suspension? I intend to only use the bike
> for touring on the road. I'm thinking no suspension to save weight.
> Thanks guys for your help.
>
> Ivan van Hoof
> ZL3TIV
>
> Sent from my
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