I show how to overhaul a bottom bracket with new sealed cartridge bearings. The bottom bracket was rough moving, and a little stiff. So I disassembled the bottom bracket, and replaced the old worn bearings with new bearings. The sealed cartridge bearings are part number 163110-2RS or (16mm ID, 31mm OD, 10mm width, and the 2RS stands for two rubber seals). The sockets I used were 5/8, and 7/8, but you can use what you have that fits. The grease I used was marine grease.
The replacement bearings cost $6.69 + tax for a total of $7.23 for a four pack on Amazon. They are probably Chinese made, but most of the bearings I was seeing seemed to be made in China. I would have liked to have gotten some nice made in Japan bearings, but I was not finding any in this size. I am sure they are out there.
Not all bottom brackets have sealed cartridge bearings. Here is a rebuild of a bottom bracket that has ball bearings:
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