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I'm quite new at biking and I got my first flat yesterday. I was able to remove the inner tube and patch it, thanks to a lot of youtube videos. But today I found the tire without pressure. And I found that the patch was leaking. I replaced the tube with my spare one. But I want to know if this is normal, for a patch, to last a few hours and then unstuck itself and let air pass?

Thanks

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    Welcome. Is this a traditional patch or self-adhesive? Did you follow all steps including the sandpaper? The traditional ones are supposed to be permanent and normally are. – Vladimir F Apr 23 at 8:07
  • I suggest checking where the tube leaks. Did you confirm the patch is loose? Isn't there a new hole? The tyre can contain a stuck sharp object. – Vladimir F Apr 23 at 8:09
  • Patch are Syncros glueless patch. They come with sandpaper: syncros.com/se/sv/product/syn-glueless-patch-kit-pak-40. And yes, I checked the inner tube, and the patch unstuck itself a little bit and the air pass through that. It's like a bubble formed from the innertube hole to the border of the patch. – Dazul Apr 23 at 8:19
  • As with housepainting, its all in the preparation. Cleaning and buffing needs to be done right, as does locating the original source of the puncture lest it cause another. – Criggie Apr 23 at 22:22
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Self adhesive patches are less reliable. I carry them (because they are so small) with my spare tube with my tubeless tyres to get home when the crap hits the fan but I witnessed some repeated struggle with some. I cannot comment your particular brand but my colleague had to re-apply some every 20 km or so.

I would use them to get home when the spare tube got punctured too. To permanently repair a tube use the traditional patches with a vulcanizing glue.

On my bikes that use inner tubes I carry the traditional patches. I want the reliability of those and have the space for them.

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  • I typically carry two spare tubes. Do enough mileage and Murphy will eventually strike. My worst was 3 flats in 25 km, all unrelated. – Criggie Apr 23 at 22:23
  • @Criggie I would carry two spares for small road tyres and especially if I had inner tubes in my tyres already. With a tubeless setup and larger tubes there is no place for a second one, but one can often repair the hole with a worm if it did not seal in the first place. And with my secondary tubed MTB I had a puncture only once in thousands of km so a second spare is a luxury and the repair kit is enough in addition to one spare. – Vladimir F Apr 24 at 6:34
  • the number of spares carried should be related to the distance one might have to walk, worst case. – Criggie Apr 24 at 8:06
  • @Criggie Our country is quite civilized, but, more importantly, I trust the repair kit more than I trust a second spare. A second spare saves one more puncture and a repair kit saves more of them. If I know my rims. Once I had a rim that tend to cut valves, but that is exceptional and it was in the UK. – Vladimir F Apr 24 at 8:12

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