Is there a strong distinction between vehicles like the Segway and diwheels where there's a very large wheel? From a technical standpoint, the Segway has its center of mass outside/above the wheel, and diwheels have their center of mass inside the wheel (usually below the axle to ensure stability, but as this video amusingly shows, it's not too hard to flip the center of mass up above the axle but still inside the wheel). Does "dicycle" apply only to vehicles with the CoG outside the wheels, and "diwheel" to those with the CoG inside the wheel?
I'm not clear enough on it, but if diwheels are going to be covered in this article, diwheel should probably redirect here, and this article should see-also monowheel. --Interiot 20:10, 30 January 2007 (UTC)