I have about 18,000 miles on my 2012 V Sedan. Original front tires still fitted, but I am replacing them next week. My concern is that when I approach 70 - 80 miles per hour, I begin to feel a slight roughness coming from the front end. It doesn't feel like wheels out balance because the steering wheel doesn't shake. It just feels rough. Is there anything I should have the service guys check when I bring it in. Could it be wheel bearings, suspension, or something else? Perhaps the tires are so badly worn that they are causing this? I don't think they will be willing to replicate the problem since it occurs above the speed limit.