Tire rot

On Mar 11, 9:01*am, datakoll wrote:
doowwwwwwwwwwwwnwind
http://www.nws.noaa.gov/aq/sectors/conus.php

say whattabout RADON?

It is a noble gas, so is unlikely to chemically affect tubber. Its
decay products are a different story. Still, without oxygen...

David A. Smith

On Mar 11, 1:31*pm, wrote:
On Tue, 11 Mar 2008 06:17:22 -0700 (PDT), datakoll

wrote:
bikes tires flatten if left in one position. Auto tires do it, people
do it, rocks do it, wine and beer do it, glass does it-glass is a
fluid.

Dear Gene,

Actually, it's a well-refuted myth that glass windows flow and sag
under gravity:

http://groups.google.com/group/rec.b...0d41637743b6c1

Some old glass windows do indeed look as if they have sagged, but they
looked that way the day they were set in the frame.

Cheers,

Carl Fogel

I remember my old grade 8 teacher telling us that glass is a very very
slow liquid- but then I discovered he was an idiot as almost all the
incredulous nonsense he taught was just that. well mr sharp; turned
out you weren't so sharp at all...sincerely, former student

On Tue, 11 Mar 2008 01:15:22 -0800, (Tom Keats)
wrote:

[snip]

I /have/ to store my main bike right beside the furnace.
But I wear my tires out just from daily use before the
furnace-motor ozone can kill 'em. But if I just permanently
left my bike out in a sunny spot in the back yard for a
year or two, (perish the thought) the tires would die long
before their time. If the bike wasn't stolen first.

As an aside thought, I also don't believe storing a bike
within a pyramid would prolong the the life of the tires ;-)
Now that I've said that, chances are Carl Fogel will try it.

Dear Tom,

Well . . .

These highwheeler tires from around 1890 are past their prime:


http://www.hochrad.info/hochradseite...e%20reifen.htm

But tire manufacturers have improved things considerably since the
1870s when rubber tires first appeared.

You'd have to store modern tires under a pyramid for years before they
reached their expected lifespan in sunlight.

The tires of cars parked on streets survive years of sunlight.

So do the tires of bicycles left outside--think of kids' bikes and
commuter bicycles.

Sunlight and ozone do indeed damage rubber, but not usually at the
rates suggested by our fevered imaginations, which lead people to
store tires in plastic bags in freezers.

Cheers,

Carl Fogel

On Tue, 11 Mar 2008 06:17:22 -0700 (PDT), datakoll
wrote:

bikes tires flatten if left in one position. Auto tires do it, people
do it, rocks do it, wine and beer do it, glass does it-glass is a
fluid.

Dear Gene,

Actually, it's a well-refuted myth that glass windows flow and sag
under gravity:


http://groups.google.com/group/rec.b...0d41637743b6c1

Some old glass windows do indeed look as if they have sagged, but they
looked that way the day they were set in the frame.

Cheers,

Carl Fogel

Tom Keats wrote:

In article ,
Just A User writes:
Can someone point me in the direction of a photo of the
damage that might occur from storing a bike with its tires on
a cold concrete floor.

In residential basements, it's not the cold concrete
floor that accelerates tire deterioration, it's the
ozone created by nearby electric motors such as those
in central heating furnaces.

N.B: Rubber doesn't "rot" as in the biological sense
of the word. Rather, it gradually but inexorably
outgasses its more volatile chemical components, causing
the rubber structure to shrink, crack, and eventually
crumble. Ozone and ultraviolet light are reputed to
hasten the process. I think the latter factor (UV light)
is the greater concern.

I /have/ to store my main bike right beside the furnace.
But I wear my tires out just from daily use before the
furnace-motor ozone can kill 'em. But if I just permanently
left my bike out in a sunny spot in the back yard for a
year or two, (perish the thought) the tires would die long
before their time. If the bike wasn't stolen first.

As an aside thought, I also don't believe storing a bike
within a pyramid would prolong the the life of the tires ;-)
Now that I've said that, chances are Carl Fogel will try it.
You can put him up to almost anything that's tastefully and
non-destructively investigative/analytical/experimental G
(I say that with the utmost respect.)

I see that Michelin claims to have addressed this issue:

"PROTEK, a brand-new technology that is particularly effective
against damage caused by UV rays, ozone, temperature variations
and pinched tubes"

http://tinyurl.com/2fnd6s

John

On Mar 11, 2:31*pm, wrote:
On Tue, 11 Mar 2008 06:17:22 -0700 (PDT), datakoll

wrote:
bikes tires flatten if left in one position. Auto tires do it, people
do it, rocks do it, wine and beer do it, glass does it-glass is a
fluid.

Dear Gene,

Actually, it's a well-refuted myth that glass windows flow and sag
under gravity:

http://groups.google.com/group/rec.b...0d41637743b6c1

Some old glass windows do indeed look as if they have sagged, but they
looked that way the day they were set in the frame.

Cheers,

Carl Fogel

Veeeaaaaaaalllllll Carl, why is the window's wide end on the bottom?
because the wide end religiously supports the narrow top or did the
masons, as experienced a crew as you'd not wanna meet, misunderstand
the flow of water?

anyway, Herpo, cycle rubber isnot autpo rubber and I have seen first
hand sunlight not Ozone degraded Conti TT. That rubber looked like uh
sundegraded rubber. You live in the desert....

In article
,
datakoll wrote:

On Mar 11, 2:31*pm, wrote:
On Tue, 11 Mar 2008 06:17:22 -0700 (PDT), datakoll

wrote:
bikes tires flatten if left in one position. Auto tires do it, people
do it, rocks do it, wine and beer do it, glass does it-glass is a
fluid.

Dear Gene,

Actually, it's a well-refuted myth that glass windows flow and sag
under gravity:

http://groups.google.com/group/rec.b...0d41637743b6c1

Some old glass windows do indeed look as if they have sagged, but they
looked that way the day they were set in the frame.

Cheers,

Carl Fogel

Veeeaaaaaaalllllll Carl, why is the window's wide end on the bottom?
because the wide end religiously supports the narrow top or did the
masons, as experienced a crew as you'd not wanna meet, misunderstand
the flow of water?

Same reason the tire's label always goes beside the tire valve:
tradition combined with some kernel of practicality.

--
Ryan Cousineau http://www.wiredcola.com/
"In other newsgroups, they killfile trolls."
"In rec.bicycles.racing, we coach them."

UNNNGH,

WHEN THE Cathedral at Chartes was restored, rumor was or is,
measurments made on stained glass set in uhuhuh 1237? showed glass was
wider at bottom than at top, that measurments conformed to equations
for glass flow.
Glass is typed as a solid liquid thru crystalized molecular structure.

That is now incorrect? My day is ruined.

Older tires set out in Florida's sun degrade without significant ozone
not so much newer compounds.

G. Daniels

"datakoll" wrote: (clip)Glass is typed as a solid liquid thru crystalized
molecular structure. (clip)
^^^^^^^^^^^^^^^^^^^
Does that mean they can be recycled into liquid crystal displays in
calculators? ;-)

On Tue, 11 Mar 2008 23:30:14 GMT, Ryan Cousineau
wrote:

In article
,
datakoll wrote:

On Mar 11, 2:31*pm, wrote:
On Tue, 11 Mar 2008 06:17:22 -0700 (PDT), datakoll

wrote:
bikes tires flatten if left in one position. Auto tires do it, people
do it, rocks do it, wine and beer do it, glass does it-glass is a
fluid.

Dear Gene,

Actually, it's a well-refuted myth that glass windows flow and sag
under gravity:

http://groups.google.com/group/rec.b...0d41637743b6c1

Some old glass windows do indeed look as if they have sagged, but they
looked that way the day they were set in the frame.

Cheers,

Carl Fogel

Veeeaaaaaaalllllll Carl, why is the window's wide end on the bottom?
because the wide end religiously supports the narrow top or did the
masons, as experienced a crew as you'd not wanna meet, misunderstand
the flow of water?

Same reason the tire's label always goes beside the tire valve:
tradition combined with some kernel of practicality.

Dear Ryan,

And like labels on tires, it turns out that some ancient windows had
the thicker end at the side or at the top, and the waviness sometimes
goes sideways.

A few links . . .

A quick summary of the legend at wikipedia:
http://en.wikipedia.org/wiki/Glass#B..._antique_glass

Nope, says Dow-Corning, a company that knows a bit about glass:
http://www.cmog.org/index.asp?pageId=745

A 1200-line hodge-podge of discussion that ends up pointing out that
the slightest flowing of glass would be grossly obvious in old
telescope lenses, but is never seen:
http://tafkac.org/science/glass.flow...he_thread.html

More fun at an urban legend site:

http://dwb.unl.edu/Teacher/NSF/C01/C...n.html#antique

Cheers,

Carl Fogel