Quote:
Originally Posted by BTM
They don't come on every car because they are expensive and are considered by many (ie non enthusiast buying public) to be a luxury or premium option.
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This. Not having to pull over on the side of the highway to change a flat is a huge convenience for most people, they would rather be able to drive straight to the dealer/repair shop instead. BMW can tout this as a safety feature as well. I don't see run flats going anywhere, at least for now.