I noticed that my car is more prone to lateral movement even on what appears to be smooth roads. With 18's I have 235's in front and 255's in back so I am guessing that the increase width along with brand new S03's are following the road imperfections too closely. I've never had excessive vibration though. If they are the same size rotate them and see what changes. And as the others said, of course have the balance checked.
Could be roads.. I notice on some roads on my jaunts to Chicago it can shake EXCESSIVELY. more than likely your balance is off. BMWs are the most sensitive to balance. You could have a wheel weight off a bit, or have slightly bent a wheel.
You should have a shop attempt to rebalance your wheels, hopefully that will take care of it.
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