Hyundai Other

I just replaced my tires. I am getting a vibration at highway speeds, not always at the same speed and sometimes does not vibrate. I have changed the tires to a different brand and still have the vibrations. The tires have been rebalanced a feww times now and still can not figure out what the vibrations stem from. The vibration seem to come around 65-70 mph and sometimes 80 mph. The steering does not pull or push so the alignment does not seem to be the problem. Can the brake rotors cause this or suspension issues? Need help please!
September 4, 2006.

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