[python] Re: Rear Suspension
- From: Patrick van Gompel <patrick_van_gompel@xxxxxxxxxxx>
- To: <python@xxxxxxxxxxxxx>
- Date: Wed, 23 Feb 2011 13:36:49 +0100
Hello,
My triangular frame is very stiff and although I have 2" fat tires (@3-4bar)
and some seat suspension, I do feel annoying vibrations on some roads. Probably
it would help if I went to 2 bar for my tires and a thicker seat cushion.
When I first saw the Python project with a front fork used in the back, I
thought this couldn't be very stable/safe. The loads are at a 90 degrees angle
of what it is designed for. But apparently it works and is strong enough. How
does it ride with heavy loads? I thought it would be a bit like a women's bike
compared to a men's bike: women's bikes are less stiff and can't really handle
heavy loads when cornering.
A problem could be kinda like this picture:
http://jasondoesitall.com/bikewith2brains/2005704BrokenFork.jpg A front fork
is not designed for heavy side loads. That wouldn't be the case for a Python
though, it would bend in the other direction.
Greetings,
Patrick
Date: Wed, 23 Feb 2011 12:05:37 +0100
From: dirk@xxxxxxxxxx
To: python@xxxxxxxxxxxxx
Subject: [python] Re: Rear Suspension
Romptekst bericht
Hi,
if you have a triangle between pivot, seat conection and brake mount/rear
wheel, this should be stiff enough even with thin tubing. Also, you could
design this triangle with just one tube going round and weld in a normal bike
fork which also gives you brake mounts. Standard forks are quite optimised in
terms of suspension.
A fat rear wheel (which needs less pressure compared to thinner ones) also
makes up for a fine suspension with low failure and maintance potential :-)
greetings,
DirkS
Jaculus <jaculusbent@xxxxxxxxx> hat am 23. Februar 2011 um 11:45
geschrieben:
> no cracks, but the rear part of the jaculus is way to rigid. Riding
> over anything but asphalt gives a headache because of the vibrations.
> I would use smaller tubing for the next one, saves weight and improves
> the ride.
>
> For the rear part of a (distant) future brother of the jaculus i was
> thinking of two straight tubes from eighter side of the rear axle to
> the sides of the pivot. These two should probably be connected just
> before the rear wheel (also brake mount) for the top support of the
> seat, and at the pivot.
>
> Jaculus
>
> 2011/2/23 Jürgen Mages <jmages@xxxxxx>:
> > Hello Rod,
> >
> > it is not a bad idea to leave out the rear suspension. Considering
the mount
> > of effort, weight and the possibility of failure it seems not really
worth
> > to include a rear suspension.
> >
> > So, I am thinking of revising my building side:
> >
> > http://www.python-lowracer.de/construction.html
> >
> > The goal is, to simplify the building process and to save weight.
> >
> > As I never rode unsuspended Pythons, I am curious to hear some
experiences
> > from you and other riders. Any cracks of the rear frame yet?
> >
> > Cheers,
> > Jürgen.
> >
> > On 22.02.2011 01:35, r.mccrady@xxxxxxxxxxx wrote:
> >>
> >> My wheel base is 114cm, with 26" (mountain bike standard) wheels. I
> >> built it following the P3 instructions from Jurgen, but I didn't
> >> include the rear suspension.
> >>
> >> -Rod McCrady Los Alamos, New Mexico, USA
> >
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> >
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http://dirk.steuwer.de
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