I have the 205/45 17 run-flats on my 11 MCS. They are okay, but I plan to go with all season regular tires when the time comes. I am thinking about going with a higher profile 205/55 or 215/55 17. First, the non run-flats should be more comfortable. Second, the higher profile should help absorb potholes, etc. a little better. Third, the slightly larger diameter tire should fill out the wheel well opening a little better without going the lowering route resulting in more of a "rally" inspired solution than "street" inspired solution. Finally, the larger tire should make the 3-4 mph speedometer error less so. Thoughts and feedback please. Has anyone else tried something like this?