Originally Posted by
T-Mar
Cartridge bearing manufacturers do specify shelf lives . Even modern synthetic greases as used in sealed cartridge bearing will eventually demulsify when stagnant for long periods. So, there is reason for concern. Regular use will keep the oil and carrier emulsified, so active bearings can have a very long lifespan and outlive stagnant bearings.
So, dumb question: I've got a couple of spare Shimano cartridge BBs in boxes since I hate being without a replacement part when I need one -- should I twist them once a year, or every couple of years, or is it really only a concern if a part goes unused for 20 years?
