Originally Posted by
Looigi
Indeed, and they wear less and last a lot longer with added grease. Bonus: Adding grease is easier, quicker and cheaper than replacing them.
As mentioned, they can easily be serviced in situ.
As said before, they wear out. My last shimano un 54 had about 3 mm of play on the drive side. I just put in a new one for about $ 28.00. YRMV.