| well i would say after you have just gotten done with a muddy wet ride or about every 5 hours. if you wash your bike alot then it should be about every 3. they are sealed bearings but sometimes the seals will go bad and start to dry rot, or get ripped or something. they have a grease in tehm that lubricates when it gets warm and then goes to a solid state when it cools down. but even with this you should grease them, and the shaft that runs through it.
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