Originally Posted by BavarianFanatic
ANY tire will end up with flat spots after parking for an extended period of time. Especially when it's cold. It's not isolated to run flats. As you've discovered, driving them until they get up to temperature or parking somewhere warm corrects it.
Same thinking, in fact in my experience non run-flats have proven worse for flat spotting in my driving environment. Drive home with warm tires, leave for a couple of days on a gravel drive, drive off on a cold morning and it takes several miles to 'round' the wheels again. Winter tires have the least issue for me.