It is usually due to at one time water got inside through a broken bead. Aired up for years the rim will corrode deteriorate the rubber bead at the same time the wire in the bead corrodes making like a super glue. When trying to break the bead the wire in the bead of many strands are fused through a heavy corrosion to the wheel. You would think penetrant would work but I had soaked one for 4 days and still had to cut it off.
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