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Old 12-01-2017, 03:11 AM   #4 (permalink)
freebeard
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Are you thinking of low-sidewall tires with side-by-side tubes? The run-flat tires I've seen had concentric inner and outer tubes.

The ultimate run-flat wheel:

bgr.com:NASA’s new titanium tires can never get a flat

It says titanium because that cool, but it's really a nickel-titanium alloy “shape memory alloy”.
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Change my, you know, the thing.

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