[python] Re: Thanks Chris! Any everyone else.
- From: Patrick van Gompel <patrick_van_gompel@xxxxxxxxxxx>
- To: "python@xxxxxxxxxxxxx" <python@xxxxxxxxxxxxx>
- Date: Wed, 3 Apr 2013 10:46:16 +0200
Hello,
The option I use for an adjustable pivot point is a 'rod end joint'. You can
see it here: http://cycle.free-creativity.com/images/python5.jpg The rod ends
are protected by a rubber boot. The cheapest and best seller I have found is:
http://mcgillmotorsports.co.uk/index.php?act=viewCat&catId=25 They have 3
types, but I prefer the 'High Performance'.
At the moment I use M12 size, which is strong enough, but for my next project I
am going for M14 as I am building a utility trike and needs to be very strong.
Not sure how many degrees I can adjust the pivot, but it depends on your design
(the distance between the two rod ends and the size of them). If you need
detailed info about those rod ends, like thread length or max. angle; it's
available (just ask).
Though, you can't adjust the pivot 'on the go'. You need to detach the front
and rear part and use shims to fit the rod ends on the pivot axle without play.
Ivan, I don't think you need suspension. Of course, my big apple 26" tires are
more comfortable than racing tires, but it is like you compare a ride on a
mountainbike with fat tires to that of a racing bike, I think. My experience
with recumbents in general is that a nice seat with a good cushion does also
give you a more comfy ride.
Greetings,
Patrick
Date: Wed, 3 Apr 2013 10:53:21 +0300
Subject: [python] Re: Thanks Chris! Any everyone else.
From: balamber@xxxxxxxxx
To: python@xxxxxxxxxxxxx
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
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