Of course, if you want ultimate efficiency/speed, pop the seals off and just run with light oil. Then flush/dry/relube after every run.
Probably not worth it outside, but might work (ish) inside.
About 85/90% of the drag in a 2RS bearing comes from the lip contact, not the balls/races. (depending on the size of the bearing, and if its knackered or not).
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