Wheels can get bent- On my old M3 I was surprised to find out that three of my OEM forged 19" wheels had bent out of round or cracked. Surprised because not one tire installer mentioned it (at 50K miles I was on my 4th set of tires), and only was brought to my attention when I refinished the wheels. Of course after polishing, and repair my slight off and on again vibration was completely gone replaced by that vibrationless new car feel.
So, if after getting a roadforce balance from a professional shop, you may want to have the wheels carefully checked for damage...
'08 E92 IB, Gone
'10 GT3 now in my garage!
'10 X5 3.5D
'12 E91 Xi Wagon MT sports package