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@Oswald
Generally, unless you're paying top dollar, sealed bicycle bearings generally are industrial bearings originally engineered for high loads and high revs. These bearings use contacting seals, and are lubricated with a lube that's not drag free. In the 'correct' industrial application the seals are broken in fast at high machine revs after which they no longer cause drag. On a bike at low revs and load this takes a little longer ..