Originally Posted by cyccommute

How? I see bottom brackets at my local co-op that are from the 90s that are still working well. I’ve personally never had a sealed bottom bracket fail on me. I’ve replaced a lot of them through upgrades but not one of them has been because the BB failed.

On the other hand, I see lots and lots and lots of loose bearing bottom brackets that have to be replaced. Even a number of very new ones.