Quote Originally Posted by claymore View Post
It's a sealed bearing inside a sealed hub how do you think water is getting in??
What happens when you heat any fluid - be it water, oil, grease (oil mixed with soap), petrol, or even air - it expands. The bearing housing, to follow the laws of physics, has to allow for fluid expansion due to heat as well as contraction with cooling. If this is a sealed unit as you suggest, then I have an engineering problem. Even "sealed" bearings often have plastic side plates to allow for expansion. A totally sealed bearing does exist where fluids surround it to carry the heat away (like high speed pump bearings) but in a car - call me cynical, but I'm yet to be convinced.