Antipuncture strips

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.
--
Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db

Are the holes on the inside (rim side) or outside (tread side). There
is a strip that is usually glued to the inside of the rim to protect
the tube from the spokes. But these sometimes wear down and can cause
little punctures like you're talking about. If yours looks worn when
you take the tire off, you can pretty easily replace it. As for the
strips that go in the tires themselves, I don't have any relevant
experience.

On Tue, 22 May 2007 15:45:36 +0200, Dieter Britz <[email hidden]>

Quoted message said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.

Dear Dieter,

Some riders who use plastic tire strips report that the end of the
strip can wear a hole in the inner tube.

To avoid this, most brands of plastic tire strips are made with
feathered ends that taper smoothly.

Unfortunately, some riders trim the feathered end to get rid of the
excess, leaving a sharp shoulder.

In any case, the protector strips don't protect the sides, so thorns
and Michelin wires can still cause small punctures, often without
leaving much trace in the tire.

Cheers,

Carl Fogel

In article <[email hidden]>,

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.

"When you have eliminated all which is impossible, then whatever
remains, however improbable, must be the truth."

-Sherlock Holmes, in "The Adventure of The Blanched Soldier." Sir
Conan-Doyle put similar words in his mouth many times.

http://www.bcpl.net/~lmoskowi/HolmesQuotes/q.detection.html

The standard cause of a puncture with no hole would be a pinch flat, in
which case the holes invariably come in a "snakebite" pair, where the
rim edges have struck the tube, with the ground acting as the anvil.

Another cause can be bad rim tape: the tube either rubs against an
exposed spoke head (or nipple end) or it enters a spoke hole in a
double-wall rim and expands until it bursts.

If your strips are causing the problem, my guess would be that they're
either rubbing holes in the tube, or that they're slightly pinching the
tube between themselves and the tire.

Try figuring out where the holes are on the tube relative to the plastic
strip, and describe the size and shape of the holes.

--
Ryan Cousineau [email hidden] http://www.wiredcola.com/
"I don't want kids who are thinking about going into mathematics
to think that they have to take drugs to succeed." -Paul Erdos

JesseHattabaugh said:

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.
--
Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db

Are the holes on the inside (rim side) or outside (tread side). There
is a strip that is usually glued to the inside of the rim to protect
the tube from the spokes. But these sometimes wear down and can cause
little punctures like you're talking about. If yours looks worn when
you take the tire off, you can pretty easily replace it. As for the
strips that go in the tires themselves, I don't have any relevant
experience.

Dieter, you should do the check Dieter mentions.

I've used Mr. Tuffy anti-puncture strips for years with good results,
but I have heard of the problem with them you speculate about. IIRC
it typically happens where the two ends of the strip overlap. Never
happened to me though.

--
JT
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John Forrest Tomlinson said:

JesseHattabaugh said:

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.
--
Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db

Are the holes on the inside (rim side) or outside (tread side). There
is a strip that is usually glued to the inside of the rim to protect
the tube from the spokes. But these sometimes wear down and can cause
little punctures like you're talking about. If yours looks worn when
you take the tire off, you can pretty easily replace it. As for the
strips that go in the tires themselves, I don't have any relevant
experience.

Dieter, you should do the check Dieter mentions.

Oops, I mean the check Jesse mentions.

Quoted message said:

I've used Mr. Tuffy anti-puncture strips for years with good results,
but I have heard of the problem with them you speculate about. IIRC
it typically happens where the two ends of the strip overlap. Never
happened to me though.

--
JT
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Ryan Cousineau said:

Try figuring out where the holes are on the tube relative to the plastic
strip, and describe the size and shape of the holes.

"When I get a hole, it's usually a spot on the innertube where rubber
should be, but there ain't none there." ;>😉

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.
--
Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db

Better to make your own strips from an old tire by removing the beads.

cheers,
Doug

Quoted message said:

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.

Better to make your own strips from an old tire by removing the beads.

Why better?
--
JT
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Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.
--
Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db

Better to make your own strips from an old tire by removing the beads.

cheers,
Doug

On May 22, 6:15 pm, John Forrest Tomlinson <[email hidden]>

Quoted message said:

Quoted message said:

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.

Quoted message said:

Better to make your own strips from an old tire by removing the beads.

Why better?

they won't get hard in a few years like the plastic ones.

Even Mr. Tuffys, which have the feathered edge, can still cut the tube
at this edge. I've had several of these types of flats over the
years. Using a file, I've feathered the edge even more, plus I've
been using a little heavier Michelin tubes - seems to have done the
trick. Might also want to try deflating the tire and rotating the
Tuffy relative to the tube every couple of months so it wears at a
different spot. Still better than not using a Tuffy if you have roads
with a lot of debris like I do on my commute.

Good luck,
Steve

Quoted message said:

On Tue, 22 May 2007 15:45:36 +0200, Dieter Britz <[email hidden]>

Quoted message said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.

Dear Dieter,

Some riders who use plastic tire strips report that the end of the
strip can wear a hole in the inner tube.

To avoid this, most brands of plastic tire strips are made with
feathered ends that taper smoothly.

Unfortunately, some riders trim the feathered end to get rid of the
excess, leaving a sharp shoulder.

In any case, the protector strips don't protect the sides, so thorns
and Michelin wires can still cause small punctures, often without
leaving much trace in the tire.

Cheers,

Carl Fogel

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.
--
Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db

Better to make your own strips from an old tire by removing the beads.

cheers,
Doug

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause
punctures. Is this correct? I can't see how, but there are these
holes, and they are not old patches that have come unstuck.

I thought you wrote "Acupuncture strips" at first.

--
Phil

JesseHattabaugh said:

Dieter Britz said:

I have had these plastic strips under my tyres for a while. Lately,
I am getting small punctures in my tubes, and there is no evidence
of a puncture in the tyre or the plastic strips. I seem to recall that
someone once mentioned that these strips can themselves cause punctures.
Is this correct? I can't see how, but there are these holes, and they
are not old patches that have come unstuck.
--
Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db

Are the holes on the inside (rim side) or outside (tread side). There
is a strip that is usually glued to the inside of the rim to protect
the tube from the spokes. But these sometimes wear down and can cause
little punctures like you're talking about. If yours looks worn when
you take the tire off, you can pretty easily replace it. As for the
strips that go in the tires themselves, I don't have any relevant
experience.

They are on the part opposite to the spoke side, i.e. on the very
outside. Also, they are not where the strip ends overlap, that was
also my first thought. They are pretty small pin holes.

The plastic strips are a few years old, so maybe they have hardened
a bit. My suspicion is that when I squeeze the tube in under the tyre
(there is not much room inside the 20 mm tyre on a 20 mm rim plus the
strip), maybe I push the strip aside, and its edge is on top, rather
than on the side.

Thank, everyone, for the ideas. I have now taken the strips out and
the Kevlar tyres will have to do the job by themselves. The trouble
here in Denmark is flint; there are lots of small flint flakes on the
road, because at one time, they spread crushed flint on the cycleways
in winter, against ice. Crushed flint seems to consist of small
pyramids, invariably standing on their base, with a needle tip. They
have stopped spreading this but there is still a lot around. The
needles even work their way through Kevlar. You need to inspect your
tyres regularly and pull the needles out - but one forgets.
--
Dieter Britz, http:<slashslash>w^3.chem.au.dk/~db

Quoted message said:

On May 22, 6:15 pm, John Forrest Tomlinson <[email hidden]>

Quoted message said:

Quoted message said:

On May 22, 6:45 am, Dieter Britz <[email hidden]> wrote:
> I have had these plastic strips under my tyres for a while. Lately,
> I am getting small punctures in my tubes, and there is no evidence
> of a puncture in the tyre or the plastic strips. I seem to recall that
> someone once mentioned that these strips can themselves cause punctures.
> Is this correct? I can't see how, but there are these holes, and they
> are not old patches that have come unstuck.

Quoted message said:

Better to make your own strips from an old tire by removing the beads.

Why better?

they won't get hard in a few years like the plastic ones.

I have some Mr. Tuffies I've been using for well over ten years.
Never had to discard a set due to hardening -- one pair may be 15
years old.

--
JT
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