what would cause a thumping in both front end tires? on 1998 Ford Explorer

a friend rotated my tires and did not balance them? would that cause the tire to feel like if u had rocks in your tires? i checked for tire pressure to make sure i had proper air pressure. and its good. front end other wise in good shape.

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1 answer 1 comment
was it this way before you rotated the tires??

no not at all.