I had the same vibratio issues with my winter wheels.To be mention that I bought my car 10 months ago so Im still in the guarantee period . After visiting BMW several times, changing tires x4 than wheelsx4, always with OEM products, ballancing than reballancing, no solution had been fund.Lakely a mechanic from a small workshop gave me the solution.Wheel hub center rings. Seems umbeliavable but some BMW wheels models are not properly centred on the hub. It is a small differences, millimiters, but this matters. My withter wheels are star 327.
After installing hub rings, those annoying vibration observed between 110-130km/h were disappearing completelly.
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