I have recently been forced to put the winter tires on due to the cold temperatures of late

. Why do I live in Toronto again...
Ever since the winter wheels were installed I have been experiencing a strange vibration through the steering wheel. I thought perhaps one of the front wheels needed to be rebalanced

.
After spending a quick $20 to have the front wheels rebalanced I still feel the vibration. By the way the vibration is only felt between 80km - 125km.
Is it possible for the rear wheels to cause this vibration through the steering wheel if one of them were out of balance?
I was also wondering about tire wear and rotation...I noticed when I went to install the wheels they were labelled strange. What I mean by this is, it looks as though the wheels might have been rotating the wrong direction during the winter last year. I believe the BMW dealer I had installed the new tires last year put them on the wrong way (ie: rotating the wrong direction)
Your thoughts please.