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a) No idea.
b) I don't know, but if I bluffed it and said "sealed", I reckon I'd get away with it. But it's a moot point, as...
c) ...the bearings aren't servicable.http://www.bikeradar.com/gear/article/workshop-how-to-service-bb30-press-fit-bottom-brackets-29544/
When did Shimano start doing pressfit bottom brackets?
Are they still loose ball or are they sealed bearing type?
Does anyone know the bearing codes or is it best to replace whole BB?