Originally Posted by
DaveSSS
Criticizing electric motor bearings is interesting. An electric motor is often expected to run 24 hours a day for 5-10 years, with nothing but an occasional squirt of grease, or in some cases with no maintenance at all. I have two 5 hp pump motors that share 24 hour per day operation. They have greased for life bearings, with no grease fittings. They've been running for 7 years now.
Nothing wrong with electric motor bearings in electric motors. There's something wrong with using them for a totally different application, though. Cartridge bearing hubs that employ angular contact bearings and a means to adjust preload, not to mention sealing appropriate to a bike hub, are far less inferior than a typical cartridge bearing hub, but they're rocking horse poo.