Yes it could be the bearings or it could be the tire.
The only way your going to know is pull the wheel. If you can pull the wheel at home get it off and stick two fingers in the bearing and see if you can feel roughness or some in and out movement when you move the bearing in a circular motion.
Hard to tell you this way.
Roll the wheel and look for cupping or look at the tread and see if there is some changes in it. Even take it to a shop and have them check the balance
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