hey man when you do your rotation before you take the front wheels off push and pull on the top and bottom of the front tires. if the hub is bad you will usually have some play in the wheel. good luck!

it is seriouse if it is a hub but there is a hole lot to think about when its just a little hum. you dont think of anything seriouse. im with you hardin thicke, i would have probably acted the same way.