My Tiberon has 17" - 5 Spoke Wheels with Khumo tires, fitted as Hyundai option. I get a vibration at 60 - 70 mph. Dealer can't resolve except to fit standard 16" wheels. All wheels have been re-balanced twice and swapped around all four corners but it does not help. Has anyone else had a similar problem and have you fixed it?

 

You might have a bent rim or a shifted belt on the tire. Did they check out aswell?