Yes, On the center of the stock flywheel it was only a couple of thousands, at the edge of the fww it is a couple hundredths. My design differs from the weights I have seen as it slips over the threaded rod that the flywheel is pushed onto, and bolts on with the stock nut. I'm pretty sure that most fww that you can buy, thread into the flywheel itself. However I belive I would be having the exact same problem as a flaw in the stock flywheel in either application should cause the problem I am having now. I talked to a guy from steathly about this and he said that the runout on the flywheel is normal. What I don't know is if there design compensates for this.