[python] Re: AW: Re: Front Suspension
- From: Olaf Johansson <olaf@xxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 25 Aug 2006 14:38:42 +0200
On 25 aug 2006, at 11.17, Ronald W. Hongsermeier wrote:
olaf@xxxxxxxxxxxx schrieb:
On 25 aug 2006, at 09.24, Ronald W. Hongsermeier wrote:
Hi Dirk and listies,
comment below in text.
dirk.bonne@xxxxxxx schrieb:
Thorsten Borm wrote:
A very simple way to have something like an suspension is this:
I use "Schwalbe Big Apple" with 50mm and 2,5 bar pressure on
both wheels. They work very good at rough roads and little
potholes. At flat roads there is nearly no noise and they are
rolling very easy. And - they are looking fine!
I have been eying these tires for some time too, but not enough
place for 50mm tires on my current python :-( On this (dutch)
website: http://www.ligfiets.net/accessoires/type.php3?id=336
it is said that "best" pressure should be at 4bars. Bert Hoge
made rolling tests for some tires (unfortunatly I have not the
article and its seems not to be available online). And the
curve rolling resistance vs. pressure for big apple has some
kind of "knik" at 4 bars * below 4bars the rolling resistance
curve decreases much with pressure increase (i.e. not linear
with pressure). * above 4bars the rolling resistance does not
decrease much more, and above are not more comfortable.
this is probably a result of designing the tires for a "sweet
spot" in rolling resistance and comfort at the given parameters.
As with all engineering, you can shoot for some targets but you
can't hit all targets at exactly the same time. ;-)
I think it is useless talking about sweet spots and specific air
pressure levels as long as you don't include a specific weight. It
is all about how the tyre deforms when meeting the tarmac and the
size of this deformation varies if you weigh 60 kg or 90 kg, if
you carry equipment or not. And how heavy the bike is.
It wasn't soooo useless-- (you do understand smileys and friends?
eg.: ":-)" is a smiley face )
Nope. I don't give a penny for those buggers. When words fail one
should remain silent. That said, it was not my intention to sound
impolite.
If one reflects upon uselessness, one will probably find that very
few things in life are truly useless.
Except smileys.
olaf
it got you to talk about specifics, which interest me very much. I
am a neophyte when it comes to the hard facts. I have now ridden 6
wedge-formed bikes mostly into the junk pile and am interested in
view of increasing back problems in a reclining position while
pedaling. It is impossible for me to have access to the engineering
parameters that guided the people at Schwalbe. I was simply trying
to make a generalization about design. However my observation is
correct and is in fact underlined by your more specific case
explanation.
A good advice given on another list is to inflate tyres with the
specific load on the bike (i.e. yourself plus bags) then inflate
until there is no deformation when you sit on the bike. If done
carefully, there will still be some "suspension" left for potholes.
The trick is finding an optimum pressure level, balancing between
comfort and minimum rolling resistance. Otherwise we would ride
on steel wheels.
I have experience trying to brake with a front rim on both concrete
and asphalt, thus I have another parameter which speaks against the
use of steel wheels ;-) However, steel wheels and tracks work very
well in dirt, but because of weight considerations are not too
practical for power requirements in the 125 watt avg. comfort range.
Hm, a good Stones album comes to mind ...
I think of something more like Phil Keaggy's "The wind behind my
back..." and if I'm on steel wheels, then I want a water cushion
under my behind, even on a recumbent.
Olaf
regards,
Ron
.
(thats what they say on that page). dirk
============================================================
This is the Python Mailinglist //www.freelists.org/list/
python Listmaster: Jürgen Mages jmages@xxxxxx To unsubscribe
send an empty mail to python-request@xxxxxxxxxxxxx with
'unsubscribe' in the subject field.
============================================================
regards,
ron
============================================================
This is the Python Mailinglist
//www.freelists.org/list/python
Listmaster: Jürgen Mages jmages@xxxxxx
To unsubscribe send an empty mail to python-request@xxxxxxxxxxxxx
with 'unsubscribe' in the subject field.
============================================================
============================================================
This is the Python Mailinglist
//www.freelists.org/list/python
Listmaster: Jürgen Mages jmages@xxxxxx
To unsubscribe send an empty mail to python-request@xxxxxxxxxxxxx
with 'unsubscribe' in the subject field.
============================================================
============================================================
This is the Python Mailinglist
//www.freelists.org/list/python
Listmaster: Jürgen Mages jmages@xxxxxx
To unsubscribe send an empty mail to
python-request@xxxxxxxxxxxxx
with 'unsubscribe' in the subject field.
============================================================
Other related posts:
