Originally Posted by
razorjack
somehow... all bearings on bikes fail, in suspension sometimes even just after few months (if you live in wet place), and seals (LLU - full contant) are not able to stop all the moisture.
....
FWIW- While we in the bike world like to believe differently, the seals on commercial bearings are NOT WEATHER SEALS. These bearings are designed for things like electric motors, or other industrial applications and the seals are dust, not water seals. In applications where weather or water resistance is needed, that's provided outside of the bearing, rather than relying on the bearing's seals.
This is why exposed "sealed" bearings don't hold up on bikes, especially mtn bikes. IME-they actually do a better job keeping water in than out.
So, do the best you can, and expect a sub-optimal service life.