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  • If its sealed you can't regrease it, it needs replacing. The noise is bits of grit/bits of the bearing getting in the way when it turns. Probably both.

    you would imagine the clicking is grit in the bearings but in my experience, taking such a bb out, cleaning everything (except for the sealed bearings which obviouly you can't get to) and replacing stops the noises - i've cleaned out loads of sealed cup bbs like that when they've been noisy but it makes no sense...hence the question.

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