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I always take a quick look after and before rides, today i found this on the rear tire.
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It is in the groove and is brittle rubber. No nail buried in it?
Sorry the photo is terrible. I made the little yellow mark to highlight the gray circle which in person looks like a nail puncture. The rubber in the circle is very brittle and can easily be removed. Its not the rubber tags from the manufacturing process.
View attachment 6242
To add: the bike has 17000kms on it and these are the 2nd set of tires.
Apologies, I should have phrased my questions better.
Did you buy that tire and have it installed on your bike, or is it from a previous owner's install? IE: Could it have been repaired without your knowledge? I was trying to eliminate if it was a string plug repair or not.
If the "brittle rubber" comes out/off very easily, then scrape it fairly hard with a key or something and remove it all if you can, get down below it to virgin rubber. You should easily be able to tell if there's a repair, a nail, a puncture, or it's just a glob of some goo stuck in your tread.
It might very well be just a wee sharp pebble with tar or bitumen stuck to it.