square wheel bicycles seem to be smashed from the driving circle, generally speaking, only A circular wheel can make the car move forward, but this is only for straight roads. As long as there is a proper road, a bicycle with a square wheel can go smoothly. So what is the right way? First, we need to have many segments of arc, and the length of each arc is equal to the length of the square. Then, when the wheel goes ahead, the square will remain tangent to the arc.