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Piece of thick old tube instead of patch?



 
 
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  #11  
Old July 17th 17, 02:40 AM posted to rec.bicycles.tech
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Default Piece of thick old tube instead of patch?

Order some larger patches? http://www.gemplers.com/tube-repair
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  #12  
Old July 17th 17, 04:49 AM posted to rec.bicycles.tech
Jeff Liebermann
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Posts: 2,569
Default Piece of thick old tube instead of patch?

On Sun, 16 Jul 2017 18:40:27 -0700 (PDT),
wrote:

Order some larger patches?
http://www.gemplers.com/tube-repair

I dunno about that. Something like this 2" x 6" patch?
http://www.gemplers.com/product/9D/Rema-6L-x-2W-Oval-Tube-Patch
It requires cold vulcanizing fluid 7A or G50T.
http://www.gemplers.com/product/7A
http://www.gemplers.com/product/G50T
At 10 patches for $25 plus chemicals, talc, shipping, and taxes,
methinks using $5 Canadian polymer banknotes might be cheaper.

Notice that the instructions at:
http://www.gemplers.com/tech/tube-repair.htm
are for an automobile tire inner tube. For bicycle tubes, methinks it
might be best to apply the rather large patch on a rounded mandrel
with a diameter slightly smaller than the bicycle tire, instead of the
traditional flat surface. That should prevent any wrinkling,
stretching, or excess tension on the patch when installed and
inflated.




--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #13  
Old July 17th 17, 09:02 AM posted to rec.bicycles.tech
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Posts: 6,194
Default Piece of thick old tube instead of patch?

Yes, Gemp is AAA.

try the LBS for a new thin wall tube sized S or greater in cross section than your stock

Buy NAPA nit Rema. NAPA may sell use able patch stock but too thick $$

Cut a rectangle of thin wall sized to wrap upwards/inwards of rim so the open rec ends are near spoke holes.

Arrange tools to mount tube in tire on rim.

Glue up, mount tube tire n pump.

Is best using a cool room.

Best fir rear tire.

That works PITA.

Buy more t u be s or change riding style.
  #14  
Old July 17th 17, 10:44 AM posted to rec.bicycles.tech
Duane[_4_]
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Posts: 1,301
Default Piece of thick old tube instead of patch?

Jeff Liebermann wrote:
On Sun, 16 Jul 2017 20:35:08 -0000 (UTC), Duane
wrote:

Jeff Liebermann wrote:
On Sun, 16 Jul 2017 18:43:23 -0000 (UTC), Duane
wrote:
Canada started making their money out of plastic. Works the charm for a
temporary patch in a slit tire.


I guess any inflationary currency will work.
(Sorry, but I just couldn't resist).


Lol. Well Ben Franks used to work as well as George Washingtons for that
matter. But the plastic pictures of someone else's queen seem to work
pretty well.


I just discovered that "plastic money" refers to credit cards, while
"polymer banknotes" are what is used for patching tires:
https://en.wikipedia.org/wiki/Polymer_banknote
I must lead a sheltered life. I've never seen a polymer banknote.

Looks like the queen is currently on the $20 banknote:
https://www.google.com/search?q=canada+polymer+banknote&tbm=isch
Too bad it has a Norway maple leaf on the front, instead of Canada
maple leaf:
http://www.cbc.ca/news/canada/ottawa/canada-s-new-20-bill-at-centre-of-maple-leaf-flap-1.1343767



Well they have an English queen, why not a Norwegian maple leaf..

The lowest denomination is $5,
http://www.bankofcanada.ca/banknotes/bank-note-series/polymer/
which is still a rather expensive tire patch, unless you cut it into
patch size pieces.


Only recommended as a temporary measure to get you home. I'm talking about
a sleeve inside the tire to keep the tube from popping through the slit in
the tire.

Looks like bicycle riding in Ottowa is ummm... thrilling:
"Cyclist survives dramatic collision after running red light" (0:25)
http://www.cbc.ca/news/canada/ottawa/cyclist-struck-dramatic-video-1.4207758
No helmet.


Saw that. Someone here recently claimed that a cyclist hitting a car that
ran a stop was at fault because it was the cyclist that hit the car. So I
guess in this case, the car would have been at fault?

--
duane
  #15  
Old July 17th 17, 02:33 PM posted to rec.bicycles.tech
Joerg[_2_]
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Posts: 4,624
Default Piece of thick old tube instead of patch?

On 2017-07-16 11:21, Ian Field wrote:


"Joerg" wrote in message
...
Got a couple of thick tubes that are damaged because of the #%&@!!
Gatorksin side wall blow-outs back when I used those tires. Expensive
at around $17/pop, don't want to throw away. Fixing small tears of
1/10" or so with REMA patches works but only for 3-6 month, then they
hiss through and I get a slow leak. I can ride home but it's annoying.


Somehow that never worked for me - I've heard of people soaking a patch
of denim in rubber solution, but I've never tried that (yet).



That sounds discouraging. I have ordered another thick tube yesterday.
Found it on EBay for $11. It would be nice not to have to throw away so
much stuff after just one event.

--
Regards, Joerg

http://www.analogconsultants.com/
  #16  
Old July 17th 17, 02:37 PM posted to rec.bicycles.tech
Joerg[_2_]
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Default Piece of thick old tube instead of patch?

On 2017-07-16 12:19, Jeff Liebermann wrote:
On Sun, 16 Jul 2017 09:47:21 -0700, Joerg
wrote:

Got a couple of thick tubes that are damaged because of the #%&@!!
Gatorksin side wall blow-outs back when I used those tires. Expensive at
around $17/pop, don't want to throw away. Fixing small tears of 1/10" or
so with REMA patches works but only for 3-6 month, then they hiss
through and I get a slow leak. I can ride home but it's annoying.

Using Slime Rubber Cement, is it possible to glue a roughened chunk of
tube material on there instead of a REMA patch or is that a recipe for
another flat? If not, are there better (= thicker) patches than REMA?


If the tire and the patch are not sufficiently flexible, they will
move relative to each other when stretched, causing the glue joint to
crack. I would make the patch with as thin and flexible rubber
material as possible so that the stretch distance is limited by rubber
tire, not the patch.


It's the opposite I believe. The REMA are thin and flexible and then
they become brittle right over the former slit in the tube. That's where
they start a slow leak. So If I could find much thicker REMA patches
posssibly everything would be fine.


If you use REMA patches, you get a chemical vulcanization seal. If
you use a piece of inner tube and some random rubber cement, I don't
know what you'll get.


I suspect it'll just fall off over time.


I couldn't determine if Slime Rubber Cement was the same as Rema
Vulcanizing Fluid. This may help:
http://forums.roadbikereview.com/general-cycling-discussion/slime-vs-rema-351443.html
Maybe try some of these:
https://www.google.com/#q=vulcanizing+cement
You may want to do a peel strength test.


We had a discussion here about that and I decided to buy a pot of Slime
rubber cement after that. I fixed one flat with that which is now
leaking. But not through the cemented area, it's the REMA patch itself
that leaks over the old tear.

--
Regards, Joerg

http://www.analogconsultants.com/
  #17  
Old July 17th 17, 02:41 PM posted to rec.bicycles.tech
Joerg[_2_]
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Posts: 4,624
Default Piece of thick old tube instead of patch?

On 2017-07-16 13:09, wrote:
On Sunday, July 16, 2017 at 9:47:26 AM UTC-7, Joerg wrote:
Got a couple of thick tubes that are damaged because of the #%&@!!
Gatorksin side wall blow-outs back when I used those tires.
Expensive at around $17/pop, don't want to throw away. Fixing small
tears of 1/10" or so with REMA patches works but only for 3-6
month, then they hiss through and I get a slow leak. I can ride
home but it's annoying.

Using Slime Rubber Cement, is it possible to glue a roughened chunk
of tube material on there instead of a REMA patch or is that a
recipe for another flat? If not, are there better (= thicker)
patches than REMA?


Latest advertisement for Kenda Valkyrie Pro - "bead to bead belt".
Might be something to look into. The prices in the magazine are
preposterous but usually the Ebay places or Amazon can get you
descent prices and delivery.


The CST Conquistare that I switched to supposedly also have bead-to-bead
belt. However, they seem to wear about twice as fast as Gatorskins. I
might have to live with that though because their side walls are so much
better and so far I always found them under $20. Assuming 1250mi the
rear would contribute 1.6c/mile to the operational costs of the road
bike :-)

--
Regards, Joerg

http://www.analogconsultants.com/
  #18  
Old July 17th 17, 02:43 PM posted to rec.bicycles.tech
Joerg[_2_]
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Posts: 4,624
Default Piece of thick old tube instead of patch?

On 2017-07-16 16:13, David Scheidt wrote:
Joerg wrote:
:Got a couple of thick tubes that are damaged because of the #%&@!!
:Gatorksin side wall blow-outs back when I used those tires. Expensive at
:around $17/pop, don't want to throw away. Fixing small tears of 1/10" or
:so with REMA patches works but only for 3-6 month, then they hiss
:through and I get a slow leak. I can ride home but it's annoying.

Perhaps learn to patch better? I have tubes with three inch tears
that have been repaired with (many, many) Rema F1 patches. They hold
in tires running from 30 to 100 psi, for years. Rema also make some
bigger patches, but I don't know if you can buy them except one at a
time in a kit.

the trick is to sand the tube until it's rough, apply fluid, let it
dry (you can't wait too long...) apply the patch, rub it firmly in
place. If you have multiple non-overlapping patches, you can put them
on at the same time. When you need to overlap, sand again, apply
fluid, let dry, etc...


I know how to fix a tire. It's the patch itself that becomes brittle
over the fixed tear and then begins a slow leak at that spot. A leak
through the patch itself. Possibly the reason is that my tubes have
0.120" or 3mm wall thickness so compared to the patch they are totally
stiff.

--
Regards, Joerg

http://www.analogconsultants.com/
  #19  
Old July 17th 17, 03:36 PM posted to rec.bicycles.tech
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Posts: 3,346
Default Piece of thick old tube instead of patch?

On Sunday, July 16, 2017 at 8:50:00 PM UTC-7, Jeff Liebermann wrote:
On Sun, 16 Jul 2017 18:40:27 -0700 (PDT),
wrote:

Order some larger patches?
http://www.gemplers.com/tube-repair

I dunno about that. Something like this 2" x 6" patch?
http://www.gemplers.com/product/9D/Rema-6L-x-2W-Oval-Tube-Patch
It requires cold vulcanizing fluid 7A or G50T.
http://www.gemplers.com/product/7A
http://www.gemplers.com/product/G50T
At 10 patches for $25 plus chemicals, talc, shipping, and taxes,
methinks using $5 Canadian polymer banknotes might be cheaper.

Notice that the instructions at:
http://www.gemplers.com/tech/tube-repair.htm
are for an automobile tire inner tube. For bicycle tubes, methinks it
might be best to apply the rather large patch on a rounded mandrel
with a diameter slightly smaller than the bicycle tire, instead of the
traditional flat surface. That should prevent any wrinkling,
stretching, or excess tension on the patch when installed and
inflated.


Has my memory gotten that bad or wasn't the point of this discussion about tears in the sidewalls of tires and not large tears in tubes?
  #20  
Old July 17th 17, 04:33 PM posted to rec.bicycles.tech
Jeff Liebermann
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Posts: 2,569
Default Piece of thick old tube instead of patch?

On Mon, 17 Jul 2017 07:36:19 -0700 (PDT), wrote:

On Sunday, July 16, 2017 at 8:50:00 PM UTC-7, Jeff Liebermann wrote:
On Sun, 16 Jul 2017 18:40:27 -0700 (PDT),

wrote:

Order some larger patches?
http://www.gemplers.com/tube-repair

I dunno about that. Something like this 2" x 6" patch?
http://www.gemplers.com/product/9D/Rema-6L-x-2W-Oval-Tube-Patch
It requires cold vulcanizing fluid 7A or G50T.
http://www.gemplers.com/product/7A
http://www.gemplers.com/product/G50T
At 10 patches for $25 plus chemicals, talc, shipping, and taxes,
methinks using $5 Canadian polymer banknotes might be cheaper.

Notice that the instructions at:
http://www.gemplers.com/tech/tube-repair.htm
are for an automobile tire inner tube. For bicycle tubes, methinks it
might be best to apply the rather large patch on a rounded mandrel
with a diameter slightly smaller than the bicycle tire, instead of the
traditional flat surface. That should prevent any wrinkling,
stretching, or excess tension on the patch when installed and
inflated.


Has my memory gotten that bad or wasn't the point of this discussion
about tears in the sidewalls of tires and not large tears in tubes?


I read it as fixing the thick expensive inner tube. The original
question:

was unclear as what was being patched. The mention of leaking air was
sufficient to convince me the question was about patching the tube,
especially since patching the side wall of the tire is not
recommended.

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 




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