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I've had a similar vibration right around 80 mph on my '15 228i base 17" wheel/tire combo (Continental runflats) since I bought the car a year or so ago. Vibration Starts about 75, gets annoying right at 80, and seems to smooth out again by 90. Too bad I can't just drive 90 all the time. ;-) I'm sure it's an out of balance rear tire since it doesn't shake the steering wheel (I HATE that). But I'm living w/ it since I probably shouldn't drive over 80 anyway (I must be getting old). I hesitate to get the tires re-balanced because past experience has taught me that the vibration will likely just get moved to another MPH range and the car is super smooth under 80 right now.
Too bad the dealer just put new tires on the car before I bought it last year.
I did contact a local shop that has a Hunter balancer. They quoted me over $200 (like $229 or something) to balance 4 tires on their fancy-pants machine. I laughed and laughed and finally replied "No thank you." I'll just keep it under 80.
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