the bearing usually fails before the hub.usually just like a non-drive front car wheel bearing-- jack up, remove tire, dust cap, cotter pin, castle nut, off it comes.
Could be the bearing race!!
one piece bearing and hub
What kind of vehicle?
Go to the link below to a diagram. If you are mechanically inclined the repairing a bad bearing will be no problem. http://www.easternmarine.com/em_store/tech_info/wheelhub_tech_info.html
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