white thing on rim around spoke holes/nipples?

On 7/6/2016 9:38 AM, Emanuel Berg wrote:
John B. writes:

No, I didn't say that all aluminum is
sheathed, only certain alloys. And all
corrosion is not galvanic either. Many metals
will corrode (oxidize) with no dissimilar
metals with in a hundred miles :-)

OK, so some alloys of aluminum are
sheathed/coated to protect them from rust and
oxidization (corrosion). This is common on
bikes. But sometimes there can still be
galvanic corrosion in the coating or normal
corrosion in the aluminum if the coating is
removed or gets old.


Right, like most any metal, micro scratches are points where
corrosion begins, especially in salt water or with
dissimilar metals nearby.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On Wed, 06 Jul 2016 16:38:54 +0200, Emanuel Berg
wrote:

John B. writes:

No, I didn't say that all aluminum is
sheathed, only certain alloys. And all
corrosion is not galvanic either. Many metals
will corrode (oxidize) with no dissimilar
metals with in a hundred miles :-)

OK, so some alloys of aluminum are
sheathed/coated to protect them from rust and
oxidization (corrosion). This is common on
bikes. But sometimes there can still be
galvanic corrosion in the coating or normal
corrosion in the aluminum if the coating is
removed or gets old.

True.... but, for example, I don't believe that frame tubes were ever
galvanized, of course they could be, but it would be rather costly as
it would have to be done after welding.

I would guess that money probably comes into it. If corrosion was a
major problem with bicycles then likely they would be made of titanium
which would last for generations. But few bikes are made from titanium
and they are costly compared to common steel.

Does one buy a bike for 800 SK or does one buy one for 8,000 SK (or
even more) :-)
--
cheers,

John B.

John B. writes:

I would guess that money probably comes into
it. If corrosion was a major problem with
bicycles then likely they would be made of
titanium which would last for generations.
But few bikes are made from titanium and they
are costly compared to common steel.

Here, let me tell you an interesting story.

In 1981, some people at Volvo thought that
bikes were a piece of cake after you had done
cars.

The idea was that instead of putting nine pipes
together into a frame, and additionally three
into a fork, you'd do the whole thing
integrally. So the whole this was done in
plastic in 80 seconds!

The project received millions in state subsidy
because the bikes were manufactured in
Norrland, which is regretably depopulated
wilderness to a large extent.

The bike - "Itera" - promised to be the
lightest, must rust-free bike ever.

For starters, the weight was actually over 19
kg! The bike was ridiculously wobbly. But the
worst thing was that dogs reportedly liked to
chew off the side stand!

Instead of spokes, there were... ah, have
a look - insane:

https://www.google.se/search?site=im...JOKv6ASs5o64Dw

More in this book, pages 62-64:

@book{cykelbok,
author = {Staffan Skott},
ISBN = {91-550-3942-1},
publisher = {Tiden},
title = {Cykelbok},
year = 1994
}

--
underground experts united .... http://user.it.uu.se/~embe8573
Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic
- so far: 56 Blogomatic articles -

On 7/7/2016 6:37 AM, Emanuel Berg wrote:
John B. writes:

I would guess that money probably comes into
it. If corrosion was a major problem with
bicycles then likely they would be made of
titanium which would last for generations.
But few bikes are made from titanium and they
are costly compared to common steel.

Here, let me tell you an interesting story.

In 1981, some people at Volvo thought that
bikes were a piece of cake after you had done
cars.

The idea was that instead of putting nine pipes
together into a frame, and additionally three
into a fork, you'd do the whole thing
integrally. So the whole this was done in
plastic in 80 seconds!

The project received millions in state subsidy
because the bikes were manufactured in
Norrland, which is regretably depopulated
wilderness to a large extent.

The bike - "Itera" - promised to be the
lightest, must rust-free bike ever.

For starters, the weight was actually over 19
kg! The bike was ridiculously wobbly. But the
worst thing was that dogs reportedly liked to
chew off the side stand!

Instead of spokes, there were... ah, have
a look - insane:

https://www.google.se/search?site=im...JOKv6ASs5o64Dw

More in this book, pages 62-64:

@book{cykelbok,
author = {Staffan Skott},
ISBN = {91-550-3942-1},
publisher = {Tiden},
title = {Cykelbok},
year = 1994
}



Although WOMBAT shows The Original Plastic Bike Company
promotional text he
http://mombat.org/MOMBAT/Museum/Plas...e_History.html

image:
https://www.firstflightbikes.com/imgs/plstbke.JPG

I could not find a report on the actual end of it which
turned out to be a fraud. At the time, savvy bicycle riders
noted that the glitzy equipment photos were standard, not
even expensive, parts sprayed with newly-introduced polymer
enamel. But the sudden popularity of lightweight bicycles
had created a frenzied investment environment and as always
some guy will usually relieve the investors of their extra
cash one way or another.


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

AMuzi writes:

I could not find a report on the actual end
of it which turned out to be a fraud. At the
time, savvy bicycle riders noted that the
glitzy equipment photos were standard, not
even expensive, parts sprayed with
newly-introduced polymer enamel. But the
sudden popularity of lightweight bicycles had
created a frenzied investment environment and
as always some guy will usually relieve the
investors of their extra cash one way
or another.

So you have a plastic bike story in your
country as well. Only that was a successful
fraud and not an honest failure like here.

This is interesting. Perhaps I will write
a short article on this - plastic bikes all over
the world! I'll look for more material and post
it if I find it.

--
underground experts united .... http://user.it.uu.se/~embe8573
Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic
- so far: 56 Blogomatic articles -

On Thu, 07 Jul 2016 07:04:50 -0500, AMuzi wrote:

On 7/7/2016 6:37 AM, Emanuel Berg wrote:
John B. writes:

I would guess that money probably comes into
it. If corrosion was a major problem with
bicycles then likely they would be made of
titanium which would last for generations.
But few bikes are made from titanium and they
are costly compared to common steel.

Here, let me tell you an interesting story.

In 1981, some people at Volvo thought that
bikes were a piece of cake after you had done
cars.

The idea was that instead of putting nine pipes
together into a frame, and additionally three
into a fork, you'd do the whole thing
integrally. So the whole this was done in
plastic in 80 seconds!

The project received millions in state subsidy
because the bikes were manufactured in
Norrland, which is regretably depopulated
wilderness to a large extent.

The bike - "Itera" - promised to be the
lightest, must rust-free bike ever.

For starters, the weight was actually over 19
kg! The bike was ridiculously wobbly. But the
worst thing was that dogs reportedly liked to
chew off the side stand!

Instead of spokes, there were... ah, have
a look - insane:

https://www.google.se/search?site=im...JOKv6ASs5o64Dw

More in this book, pages 62-64:

@book{cykelbok,
author = {Staffan Skott},
ISBN = {91-550-3942-1},
publisher = {Tiden},
title = {Cykelbok},
year = 1994
}



Although WOMBAT shows The Original Plastic Bike Company
promotional text he
http://mombat.org/MOMBAT/Museum/Plas...e_History.html

image:
https://www.firstflightbikes.com/imgs/plstbke.JPG

I could not find a report on the actual end of it which
turned out to be a fraud. At the time, savvy bicycle riders
noted that the glitzy equipment photos were standard, not
even expensive, parts sprayed with newly-introduced polymer
enamel. But the sudden popularity of lightweight bicycles
had created a frenzied investment environment and as always
some guy will usually relieve the investors of their extra
cash one way or another.

Well, they before their time. Now plastic bikes sell for thousands of
dollars and the top racers use them :-)

They even make plastic boats and a good friend sailed one around the
world a couple of years ago :-)
--
cheers,

John B.