How often should wheel bearings be repacked?

delwhjr wrote:
Mileage, Non-use vs Use, Environment, and Warranty are all factors to consider when deciding the frequency of any maintenance. I agree that every year seems too often and I usually do an every other year routine. If you have any kind of warranty then regardless of how you feel you have to follow their requirements.
I also use a infrared thermometer to check heat from the wheels and hubs during trips. If the temperature starts to climb too much I start to look for answers.
Heat is the killer and the first indicator of problems.

X2 I have a infrared thermometric too. You can pick one up cheap these days and throw it in a door pocket of your pickup.

I point it at the tread of the tires too. If one is a lot higher then the rest of them then there is a problem that need to be checked out ASAP.