mcclaine

my mother purchased a 07 GS300 after having cadillac devilles for a number of years. the GS300 has the Dunlop run flats and the ride is rough. she loves the car but hates the ride. i have been reading the forum posts and it appears that replaceing the run flats with traditional tires will improve the ride. my mother is not concerned about performance at high speeds. which brand of tire will give the best improvement in ride. would appreciate suggestions.