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Hole in patch

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Hole in patch

Old 10-25-17, 10:09 AM
  #1  
mathews023
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Hole in patch

https://imgur.com/a/WIGwi

Why is this happening?

Tube will probably hold for ~1 hr (w/ the bike stationary)

Tire is 29 x 2.1, tube is 29 x 1.75-2.125
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Old 10-25-17, 10:15 AM
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KLiNCK
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If the patch is on the "spoke side" of the tube - I'd wager rim tape issues.
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Old 10-25-17, 10:20 AM
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Tire Patch Hernia? Ouch!

How big was the hole underneath? Looks huge. Might have been too big to patch?
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Old 10-25-17, 05:37 PM
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Have you inspected the rim in the same spot the hole is at.
It looks like rim tape isn't holding if a double wall rim or not thick enough if a single wall. (or a spoke end protruding)
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Old 10-25-17, 05:38 PM
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mathews023
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I checked the rim tape and I flipped the tube with the same result. The hole is really small, can't see it without inflating the tube.
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Old 10-25-17, 07:10 PM
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There is simply no way for such a hole to occur without something to puncture it, or a path out of the tire for the tube or patch to escape. Bottom line is that you have not yet identified and eliminated the cause of the original flat.
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Old 10-25-17, 08:24 PM
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That the patch's base layer is showing around the hole's rim to me suggests that the tube/patch is not completely contained, it's poking out through a tire cut, rim strip not covering the nipple/access hole When the tube is fully inflated.


Was the cause of the initial flat ever discovered and that corrected? One ironic cause can be that the offending object (that poked through the tire) was still in the tire and just repoked the tube right where it had done so before.


We see rubber rim strips used on double walled rims that when the tire is inflated will be pushed down and into the nipple access holes. The hole's edge will become exposed. When the tube/tire goes flat the pressure forcing the rim strip into the hole if relieved and the rim strip returns to the unstressed location and all on take apart looks "right". Andy.
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Old 10-25-17, 08:27 PM
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On the Bright Side

maintaining consistent orientation when reinstalling tire/tube is good technique
so congrats on doing that part right
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Old 10-25-17, 08:40 PM
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One reason I like to patch tubes whenever possible is that new patch tells me where to look for the cause. The cause will be at the patch (or the same distance from the valve on the other side. I just count spokes.

Ben
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Old 10-26-17, 06:49 PM
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Which side of the tube was the hole on? Spoke side? Tire side?

Is that an ordinary tube, or an extra thick "thorn proof" tube?

Is the tube undersized for the tire?

I had a tube I was trying to patch for someone. Too hot of a day, too little time to properly let it sit and cure, and undersized thornproof tube (balloon beach tire). It took too much pressure to stretch the tube to the tire size, and would blow off the patch before it got up to pressure.
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Old 10-27-17, 02:56 PM
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Is it actually the rim tape of old with adhesive? Or the things I'd call rim strips with no adhesive that some makers call rim tape?

From the dust or talc on the tube patch it looks like the hole was centered on the spoke channel and right on a spoke hole. Double wall rim right? So if this is what I call a rim strip, then it moved during the installation and exposed the spoke hole.

But maybe other things caused the marks I'm seeing. So you'll have to help us out more.
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Old 10-28-17, 07:25 AM
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Rim side. Rim tape looks fairly new. Ordinary tube.

I just bought a new tube. Works fine.
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Old 10-30-17, 12:12 AM
  #13  
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Originally Posted by mathews023 View Post
Rim side. Rim tape looks fairly new. Ordinary tube.

I just bought a new tube. Works fine.
What kind of rim tape is it. I wrote here a bit about various types and which are good for what:

Rim tape types
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Old 10-30-17, 06:40 AM
  #14  
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Originally Posted by mathews023 View Post
Rim side. Rim tape looks fairly new. Ordinary tube.
Your rim strip is the problem. It's allowing the tube to expand into the inner wall of the rim and then blow out. I suspect that you either have a rubber rim strip or you have a plastic one that is defective. Either way, change it. Velox tape is about the best I've ever used and can be reused endlessly.

Originally Posted by mathews023 View Post
I just bought a new tube. Works fine.
For a while. If you don't fix the problem, it will just keep coming back.
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