That's what I use. It does not fold and is slower than most normal bicycles. But very light weight and it's mechanics are easy to understand and repair even for me.
What kind of speed can you attain on one of those? I have one with a 26" tire (mountain-bike size), because I've pretty tall, but I still haven't quite got the hang of riding it.
By the way: My recumbent bike has even smaller tires (20") but it is way faster. The size of the tires is not the limiting factor in unicycle speed --- it's the fact that you have to keep balance and input power using the same system.
Right, which is why my speed tends to very briefly approach terminal velocity.
I have a fixed-gear mountain bike with 700c x 42mm ("really big") tires, and that doesn't really affect speed much either. The wheels very clearly have a sort of flywheel effect, though: once I'm moving, they hold a lot of momentum. (It's excellent for commuting in snow, BTW.)
That's what I use. It does not fold and is slower than most normal bicycles. But very light weight and it's mechanics are easy to understand and repair even for me.