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TooTallTim
But we know how they stay up. I guess maybe you're aware the gyroscopic effect of the wheels has been debunked by that guy who put counter-rotating wheels next to the working wheels? Which leaves a single possibility: the steering geometry makes it so the bike automatically steers into whichever direction it's falling.
Essentially, all bikes get down the road by subtly zigzagging as they continually begin to fall left and right.