Near as I could tell when I was shopping for the car, BMW doesn't even ship anything less than 20" rims on the m40i. At least not to the West Coast. The sales manager even checked, supposedly, dealers all the way up to Oregon to see if he could arrange a dealer trade. That, as well as the combination of options I wanted, including a donut spare tire so I could widen my choices for rubber, made it so that the most sensible thing was to order the car from the factory. And even then, the smallest rims available were 19". This big wheel thing has gotten out of hand.