so i have a weird thumping sound every tire rotation, it souns like the rear passengers side the sound isnt that bad people that i had in the car didnt notice it until i mentioned it, but i hear it and it is kinda driving me crazy lol, the car is at stick height so there is no rubbin, i checked all the tired for objects like rocks or screws and there was nothing there. the only thing that i can think of is that other night i was coming around a bend pretty fast and came up on a car pretty aggressivly and she got scared and hit the break and swerved so i hit the breaks and slid with the breaks locked good, so i am thinking possibly a slight flat spot, wat do u think?

 

Slight flat spot or tread separation.

How to tell if a tire is round.
Jack the car up and set up an alignment tool under the tire. A straight edge of some sort. Just as long as it can be fixed in a steady position. Make it as close to the tread as possible with out touching. And make sure it is even across the tire tread at a right angle. Now rotate the tire and watch the surface of the tread next to the straight edge. look for any distance variance in the tire in relation to the straight edge.
If you don't have a straight edge the ground/driveway surface will work too. Just lower the car down close to the ground/concrete and spin the tire.
Sometimes you can just spin the tire and see whether it is out of round.

 

thanks i will try this tomorrow.