[JimD]

I don't think any M car has had run flats. That says a lot about what BMW thinks about performance.

My car handles and rides noticably better on Michelin PSS. We have few potholes here in SC but I wore my run flats out and then put the Michelins on the stock wheels.

I have that Road and Track (I bought it for the article on the kit car). I need to look at it closer but I don't think it is factual. They argue that a larger tire gives you more contact area but not a wider tire. That doesn't seem right to me but I haven't finished thinking about it.

Jim