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.
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.