Ok so I have a bugeye RS with a set of ADR wheels and 225/35/R19 General G-Max ASO-3 tires. I have forever for the life of my car had a vibration in the rear end even after a tire rotation/ new tires balanced etc. What could be causing this? Is it common for a subaru bugeye to vibrate at 55-60 mph. This is the only speed it vibrates at.