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If you have heavy vibration between 70 to 80, its definitely not simple weight balance. Its what I and many other people had (defective out of round tire or like me (all 4 rims where bent from the factory!!!). I have a 2011 BMW 535i xdrive. The dealer replaced all 4 rims but hell my car still has a small vibe from the rear at 70-80 mph due to a slightly out of round tire but its so small that I will correct it soon. These BMW f10 are super sensitive to tire balance, rim runout, etc than the other ones including my E92 coupe.
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