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Nope. That heat has to go through the tire, which is MUCH thicker and shows no sign of wear. Enough heat to fail the tube would cause the tire to actually melt. The heat would transfer much faster through the steel wheel. Also, the brake pads are much larger than the small areas of defect. The defect areas seem to have tight boundaries.
And the most definite reason that's not it: For this failure, all three areas are on the valve side of the tube - away from the brakes. I didn't save the tube from my earlier failure.
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1969 T337E
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