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If the tire/rim seam is leaking, I suspect the aluminum rim is either corroded / pitted some or if there's a clear coat, some is gone(allowing the leak).
You can sand the inner edge of the rim (where the bead meets).
A customer of mine with really small, stout tires was doing the same thing (steel wheel, approx. 8"). We sanded it smooth, it was slightly bent but it still leaked.
He brought it to a tire store and they used something around the bead (some sort of liquid sealer I gather) and that fixed that slow leak.
(I had previously replaced the valve as that had ripped at the base-so two issues)
You can sand the inner edge of the rim (where the bead meets).
A customer of mine with really small, stout tires was doing the same thing (steel wheel, approx. 8"). We sanded it smooth, it was slightly bent but it still leaked.
He brought it to a tire store and they used something around the bead (some sort of liquid sealer I gather) and that fixed that slow leak.
(I had previously replaced the valve as that had ripped at the base-so two issues)