vibration issue

I own a 1994 honda accord LX and I purchased goodyear triple threads 195/70/r14 from sams club last september. They were mounted onto the standard wheels with hubcaps. Ever since I've had them everytime I go over 55 I get a good bit of vibration. I've had them balanced 5 times frmo sams and 1 time from outside dealer. Any ideas on what the problem could be let me know thank you.

It could be a number of things. Bad tire, try rotating them and see what happens. If the vibrations is different after rotation you have a bad tire or bent wheel. If the vibration didn't change you could have worn suspension bushings, bad tie rods, ball joints.