Have the same noise (205/55/16 Goodyear EffecientGrip RFT) above 120 km/h. According to my friendly BMW service, it is tyre / road noise and it is normal. I agree, because the noise (pitch and volume) is quite different, according to the road surface.
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2011- : BMW 116i (F20)
2009-11: BMW Z4 2.5si (E85)
2007-09: Mini Cooper S (R56)
2005-07: BMW 325ti (E46)
2004-05: BMW 318i (E36)
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