Sealed bearings require much maintenance?
Hi all...Am wondering whether sealed bearings in wheel hubs and pedals should be regularly maintained or just serviced when problems arise? I ask because, for example, my wheels come with the recommendation to repack or replace the sealed bearing units every 3k miles, but a mechanic acted as if he'd never heard of anyone doing such a thing. Similarly, a repair book recommends servicing pedal bearings, but I have never heard of anyone doing anything to pedals (other than replace them). What say ya'll?