Some others here have commented on a "hollow" noise that probably emanates from the run flats. I've got the basic 18's and don't hear any noise. I do think the ride can be improved with non-run flats, and as soon as these tires show wear, it's good bye to runflats for me.

__________________
E70 X5 3.0si Space Grey

E36 Z3 2.5i Roadster, Sterling Gray Metallic