Not all bearings are the same

Chances are if you run a sealed bearing bottom bracket that you are using a 6903 bearing. Many sealed bearings for full suspension linkages also run the 6903 and even some wheels do. They are readily available from many sources and ranges from cheap cheap to higher end SKF, ABI. Actually the cheap cheap ones are still pretty good. But the price difference between the cheap ones and higher end ones isn't too bad if you are buying a few here and there. Like a buck or two difference.

One you may not have heard of is the ENDURO MAX bearing.
Made by ABI Industries


6903 2RS which I think means that is has two seals on it.

It is slightly different in that it runs more ball bearings so the load is more distributed among the bearings.

regular 6903 on Left, Enduro MAX on right

The weight difference is 1gram so inconsequential. Available through any QBP dealer.

One trick you can do if you want to cut down on drag is to remove the seal that is going to be on the inside of the BB shell. It won't see as much dirt/water as the one facing the outside, but it won't last as long.