Originally Posted by cru jones 2
unsealed hubs can actually spin better vs. sealed. back in the day pro's like billy griggs actually ran campi hubs that he would repack every few weeks. the big advantage to sealed hubs is that they are, for the most part, maintainance free.
He's right...quality unsealed bearings, properly maintained and adjusted will outperform sealed. Unsealed bearings are also adjustable, sealed typically are not. However, not many BMXers are religious (or even remotely skilled) enough at maintaining their bikes to realize the benefits of good loose-ball bearings.