Chariots are like trikes and trikes have a different issue with stability. Having two wheels like a hoverboard/segue requires technology to balance for you. It’s not so much new science but packaging gyroscopes and drive power had been difficult for a long time. A two wheel unicycle sounds miserable. The gyroscopic effect helps balance the bike in the same direction the bike wheel rotates and you have two in a row so it’s harder to just end up on your back or face. If you don’t have something keeping you from doing that moving would require lots of skill.
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