You should be talking about Lexing's unicycle V3, right? Because, as far as I know, only the Lexing unicycle V3 has this kind of "wheel-assisted" design, which was initiated by them. The advantage of this design is to make the unicycle run more stably. Because unicycle, like two-wheeled balance car, also uses the principle of "dynamic self-balance", the balance before and after is easier to adjust by its own gravity induction. However, the left-right adjustment is difficult to control because of its appearance. So when the unicycle is standing still, it is more difficult to stand alone. Usually left or right. The design of "parallel wheel assistance" overcomes this point, and it is easier to achieve the balance in the left and right directions. Therefore, Lexing unicycle V3 can be unique, unique in the balance car industry. Another advantage of this is to make the parking posture of the balance car more elegant. Other balance cars, after you get off, will fall to the ground, but the Lexing unicycle V3 will not, which is their uniqueness.