What are my options for replacing a Shimano Hollowtech II BB?
There are a number of options for replacing a Hollowtech II BB (whilst still retaining the Shimano cranks). The Deore bb is a cheap bb, higher Shimano levels should last better. Anecdotally I've heard premium Bb's last years while it's not unusual to use a Shimano BB a season.

The options are:


Shimano - Shimano has a number of different levels. BB51 deore level, BB70 SLX/XT and BB93 XTR
Other similar brands - Raceface X-type is compatible
Premium brands - Hope, Chris King and others
Hacks - replacing and upgrading the bearings while retaining the Shimano cups.


If you kill many bottom bearings it's good to understand why and address this. Water retention in the shell is a big issue if you ride in wet areas as is washing the grease out with a pressure washer. There are Bb's that have water drains built into the cups for drainage or you can drill a hole in your Bb shell if this is a real issue for you. Sealed bearings offer better water protection.

End of the day it's really a value choice, if you go through a lot of Bbs you should consider a premium one.