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1. Try something with airless tires and get back to us.
2. There are still many elements flexing in the Tweel so I wouldn't think it prudent to speculate on r.r. vs. conventional.
3. Why would adding a sidewall kill the r.r. part? It could be made much thinner/more pliant than a load supporting sidewall.
6. It is tough to come up with materials/structures that weigh less than air.
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