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@gbj_tester
I think 304 (aka 18/8) can suffer SCC, but the conditions on a bicycle wheel don't appear to be severe enough to make it a problem. Cl- seems to be the culprit, destroying the passivation layer, but only when there is insufficient oxygen to maintain it. Probably a problem for things which are constantly immersed in a chloride solution, but not so much for something which dries out in the air most of the time.