I have found bead leaks before coming right from where the barcode is stuck to the tire bead in the sealing area. Bad place to put it. Some of them peel off easy, others not so much. On those I will usually brush a little sealer on it. Michelin used to put them in the middle of the sidewall, and that wasn't good either. Since after it goes on the car, who cares what the barcode number is? They should put them on the tread, or decal and let it wear off!
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