[KSagal]

This one scares me far more than yike, but neither excites me. I am curious however.

On this one, although he does not know how to ride a segway, he misses a very important point. He says you pull back on the handlebar to stop a segway. I believe he also mentions that you have to lean back.

At that point, the conversation goes on to a hand break lever, and eventually a disk brake.

At most any speed, if you apply a binder break like this to the one and only wheel, your momentum on the top of that wheel will require that you move forward and the brake will assure that the tire does not, and the result is a face plant every time.

If you lean back like on a segway, the braking may work, but a lever in your hand at the front of the unike, like on the handlebar, and no requirement to lean back, means that he must have some sort of device on this unike that can suspend physics. There are laws to mass and movement that simply will not allow for a binder style disk break.