Good aftermarket bearings. I would go ahead and massage some regular moly grease into the rollers. I know that they are already greased but a little more doesn't hurt a thing and might even prolong the life of the bearings.
There should be a size stamped on the bearing. I got mine from Timkin. But that be said, I have not seen a bad made bearing yet. I just replaced my neighbors with "All Balls" look just like the Timkin in every aspect - they probably are. The key is maintenance. They need to be removed, cleaned, checked and re-packed every so often. And how many people really do that? My neighbor had his bike for 12 years, never had the tree apart. It looked like it inside as well. The grease had turned to what looked like dried lacquer, really stiff, some of the bearings would not even turn.
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