I, too, wonder about tires with these things. Don't get me wrong, I think the homemade device is exceptionally clever and well done. I have genuine admiration for people who can conceive and develop stuff like this on their own. But the first thing I thought about when I watched the video was the stress on the sidewalls of the tires when the 360 degree spin was being demonstrated. With that kind of rotation I would think some forward or backward motion should also be used.
As a mostly solo traveler, these kinds of contraptions really interest me as a means of reducing stress and allowing more enjoyment without the need to worry about what kind of tight spot might be facing me when I arrive at my destination.
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Ho'onanea (Ho Oh Na Nay Uh) -- to pass the time with peace, ease, and pleasure.
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