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Knut, I'm not completely clear on what you are asking, but both the skimmed and ribbed (Ranger 750) hubs found on P11's run on ball bearings, not the roller bearings.  The wider hub was acquired as a bare hub at a swap meet and is of unknown origin.  Neither of my P11's were purchased new so it is feasible that the hubs have been changed, but between myself and my good friend we have at least 6-8 sets of wheels and all the hubs are the same.