Originally Posted by VWtoBMW
I should add to my earlier post that although I prefer the look of my 19" summer wheels, the drive using 18" Pirelli Sottozero's for winter, non run flat, is amazing. Smooth, quiet and forgiving on every bump.
I think a good bit of the ride difference is run flat to non run flat.
I run non run flat summer tires on the 351 19 inch wheels and winter non run flat on 350 18 inch wheels.
The height of the 245/45 x 18 sidewall does seem more appropriate and robust on poor road surfaces.