[python] Re: AW: Re: Front Suspension
- From: Olaf Johansson <olaf@xxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Fri, 25 Aug 2006 10:24:01 +0200
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.
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.
Hm, a good Stones album comes to mind ...
Olaf
.
(thats what they say on that page). dirk
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regards,
ron
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Olaf Johansson
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