[dm135is]

I have the same noise as the OP on my 2013 135i M Sport. It improved when I washed my wheels really well (on the car) but seems to be returning since then. I'm going to pull the wheels, clean them, and hose out the entire wheel well area.

A couple months ago I had a terrible squealing from the left rear, turned out a small rock was stuck between the rotor & dust shield. Therefore, I think these noises MAY be related to dust & crap that builds up & sticks there over time.

The noise is often hard to hear, gotta drive alongside a wall or through a tunnel or something so the sound bounces back to you. It is incredibly annoying in a high-end automobile - but then again, my Cayman rear view mirror fell off on the way to a drivers school, so stuff happens.

EDIT: I have the original Dunlop run flat tires.