Not very practical then especially when very few tyre retailers stock them.
How do you know this? Have you shopped for them? Runflats are designed to do just that run for some 50miles and are NOT rare. If the sidewall is damaged then ALL tyres are scrap.
How do I know this? we had 2 cars with run flats and having spoken to local tyre places no kept run flats in stock. Even the BMW dealer had to order them in. Not much use are they in the North of Scotland on a wet Sunday afternoon 50+ miles from the nearest big city. With a wrecked sidewall the range is actually zero miles.
With a spare you could complete the journey and sort the next morning.
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