Originally Posted by
desertdork
The inner protective sleeve may say "sealed," and it does have seals, but it still needs to be maintained,...as per Shimano's instructions. As I understand, it's essentially an adjustable cup & cone BB with needle and ball bearings and needs periodic cleaning and greasing.
Thanks for explaining that. I've never used a Dura-Ace 7700 bottom bracket. Just about all of my experience is with the Shimano 50 and 70 bottom brackets, and I don't take them apart (have never needed to).