I really want to get the Sport Package when I order the E90, but I live in the NYC metro area... Because of this, I would not be able to keep the performance tires on during winter months... I don't have anywhere to switch out or store tires, so I was wondering if all season run flats were a option for me to buy after getting the car? I currently have them on my E46 330i with 17" tires, and I have never had a problem during the winter months.

Thanks