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> I read an article today on the internet...
Stop it. You'll go blind.
But seriously, both of the previous responses make good points. Quite a number of people smarter than I have expressed well-founded doubts about the safety of WD40 on different ring materials. And even though you're not really trying to lubricate the inside of the chain rollers any more, you do want to minimize both wear and rust on the outer roller surfaces and the sprockets. This takes a lubricant with significantly more film strength than WD40.
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John
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