I do have several sizes of UW. I’ve ridden them for a while before, and I could probably only ride 100 meters or so without dismounting. However, I found my feet arch aching after a short distance, and I hate the tire rubbing my legs. So I decided to practice more on a standard unicycle wheel without the frame to build better side-to-side balance before I return to these UWs(except the 10" one that never rubs my legs). However, the unicycle wheel is much harder than any UW of any size. I can only ride it 11 revolutions at most after quite some practice, and still can’t make turns.