How do you fix a puncture?

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Mick F
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How do you fix a puncture?

Postby Mick F » 9 Feb 2014, 10:10am

Yes, it was my fault, I nicked the tube when fitting a tyre! :oops:

The tube (was) in good condition and is a narrow tube. The smallest patch is wider than the flat tube. I used a piece of sandpaper on the area and followed the instructions in the puncture outfit, and applied the patch - but it isn't easy with a narrow tube.

I inflated the tube a little and inspected the patch - seemed fine, and let it dry for an hour.
I placed it in the kitchen sink and saw no bubbles anywhere.
I refitted the tube and tyre - carefully - and inflated partially.
Within an hour or two, the tyre was flat. :oops:

I took it out, and saw no problem, and inflated the tube quite a bit and re-immersed it in the sink.
No bubbles at all.
I pumped the tube up a lot! , and looked again.
No bubbles at all.
I re-fitted yet again and inflated the tyre.
Within an hour it was flat.

I fitted a brand new tube nearly 24hrs ago, and it's still rock hard.
Meanwhile, I inflated the old tube and it's still inflated. :evil:
Mick F. Cornwall


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Redvee
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Re: How do you fix a puncture?

Postby Redvee » 9 Feb 2014, 10:41am

I do the 'drown the tube' thing too but I do a batch of repairs in one session. I wait till I have 6 tubes to repair which can take a while. Only, touch wood, had one so far this year.

The Mechanic
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Re: How do you fix a puncture?

Postby The Mechanic » 9 Feb 2014, 10:43am

I just replace the tube with a new one. Life is too short :)
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PDQ
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Re: How do you fix a puncture?

Postby PDQ » 9 Feb 2014, 10:45am

What's a puncture? :oops: :wink:

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531colin
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Re: How do you fix a puncture?

Postby 531colin » 9 Feb 2014, 11:47am

Sand an area bigger than the patch.
Apply a thin film of solution, let it dry completely......repeat.
Only when completely dry, apply the patch firmly.
Apply French chalk (or roadside dust) over any solution outside the patch.

Inflate the tube until just 3-dimensional, then fit tube into tyre and fit tyre onto rim......with your fingers, not levers.

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gaz
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Re: How do you fix a puncture?

Postby gaz » 9 Feb 2014, 12:02pm

You missed a step.

Pray that the glue in the tube hasn't dried out. :wink:
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fatboy
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Re: How do you fix a puncture?

Postby fatboy » 9 Feb 2014, 12:17pm

gaz wrote:You missed a step.

Pray that the glue in the tube hasn't dried out. :wink:


And the "swear a lot stage"!
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Ray
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Re: How do you fix a puncture?

Postby Ray » 9 Feb 2014, 12:28pm

531colin wrote:Apply French chalk (or roadside dust) over any solution outside the patch.

:lol: :lol: :lol:
Ray
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531colin
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Re: How do you fix a puncture?

Postby 531colin » 9 Feb 2014, 1:31pm

gaz wrote:You missed a step.

Pray that the glue in the tube hasn't dried out. :wink:


It only dries out if you open the wrong end....that is, the end with the screw cap that the manufacturer wants you to open.
If you open the other (ie right, ie manufacturer's "wrong") end by un-rolling the tube, you can re-seal it by rolling it up again. ...simples.. :wink:

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StellaLdn.
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Re: How do you fix a puncture?

Postby StellaLdn. » 9 Feb 2014, 1:37pm

I don't bother with repairing, but fit a new tube straight away. Without wanting to jinx it: I've just had my first puncture since last year May, despite my cycling every day. Hopefully that's the one I have per year out of the way and I can merrily go on my rides.
As suggested by someone else, if you submerge the tube in water and there's nothing, it can be the valve.
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531colin
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Re: How do you fix a puncture?

Postby 531colin » 9 Feb 2014, 1:39pm

Ray wrote:
531colin wrote:Apply French chalk (or roadside dust) over any solution outside the patch./quote]
:lol: :lol: :lol:


Dunking it in a puddle seems to work just as well.
At the roadside I normally just fit a spare tube in these affluent days. But I stopped carrying French chalk long ago, when punctures were far more frequent and a spare tube was a bit of a luxury.

Brucey
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Re: How do you fix a puncture?

Postby Brucey » 9 Feb 2014, 1:50pm

Mick F wrote: I inflated the tube a little and inspected the patch - seemed fine, and let it dry for an hour.
I placed it in the kitchen sink and saw no bubbles anywhere.
I refitted the tube and tyre - carefully - and inflated partially.
Within an hour or two, the tyre was flat. :oops:


it sounds to me that you might have a lifting patch. Typically the patch will lift when the tyre is fully inflated but not any other time.

A lifting patch will often allow the tyre to deflate in a few seconds, but that might be hours days or weeks after the patch was applied and the tyre inflated.

If it goes down slowly then there will be a leak; try putting the whole wheel edge into water to find it; this will allow a leak to checked for at full pressure.

You can often tell that a patch has lifted; if it is a feather edge patch there will be a little wrinkle at one point round the edge of the patch.

The most common causes of lifting patches are inadequate abrasion and/or contamination. I generally mechanically abrade by machine these days; it is much faster, more thorough and more reliable.

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

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cycleruk
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Re: How do you fix a puncture?

Postby cycleruk » 9 Feb 2014, 1:51pm

531colin wrote:
Ray wrote:
531colin wrote:Apply French chalk (or roadside dust) over any solution outside the patch./quote]
:lol: :lol: :lol:


Dunking it in a puddle seems to work just as well.
At the roadside I normally just fit a spare tube in these affluent days. But I stopped carrying French chalk long ago, when punctures were far more frequent and a spare tube was a bit of a luxury.


I believe talcum powder works as well.
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Elizabethsdad
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Re: How do you fix a puncture?

Postby Elizabethsdad » 9 Feb 2014, 3:03pm

robgul wrote:Valve?

Rob

+1 I had a similar thing happen to me fitting a new inner tube - assumed I had pinched it putting it in but when I swapped with another new tube couldn't find any holes. The reason I think it may have been the valve (presta) is that the inner bit came off when I disconnected the pump after checking it suggesting it hadn't been screwed quite firmly enough.