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Helium is lighter than air, but would also leak out through normal rubber tires, so this was a "practical joke" as to reality....at this time. I had a BFG 40 series TA which had a "Serious" sidewall issue about 45 years ago, which I "Repaired " with one one those tubeless tire repair kits. It consisted of 3 cords of the patch, in a 1/2 inch hole in the side wall of a BFG Radial TA . It lasted over 40 mies, wen I got out and held the lighter to see where the leak was,( It's ALWAYS at night) , I had about a two foot flame directly out of the 1/2 inch hole, drat! A few year in the HVAC business told me to just put my hand over the hole...flameout, 3 more plugs and 125 miles later, were home. Tire air in a can "IS" flammable!
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