Just by initial look at the design - I would say it is a lot of money to spend on something that looks like it doesn't provide enough protection.
Our ambulances (old job) were required to have a run flat system which was actually an inner non-air inflated tire that only allowed the tire to drop a couple of inches. In fact the entire tire could blow off and the inner rubber system would keep you from loosing control. If the outer tire was not damaged beyond use, you could continue driving without any air (hence get your patient to his destination). BMW uses a similar system as an option.
LonnieB or Glenn may have some more insight, but I just don't see this system as filling enough of a gap between the tire and the rim to prevent bead loss, and sure doesn't look like it would stabilize the tire on the rim enough to keep control any better than without it.
JMHO
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