Wheel runout noise?

[6886auto]

What amount of runout would be considered ok for a 12" steel wheel.

When I balanced my wheels one looked worse than the others. I am having a noise at 100km/h that I think might be a bent wheel.

I have three more wheels to choose from, I just need to paint them and change the tyres.

I think if I switch the front wheels to the back it should change enough to tell me if my theory is correct.