So I'm going with Tubular Clincher tires on my clincher training wheels to see how they work. I just bought some Tufo C Elites. They are basically a tubular tire (as we know them) with a bead attached to the casing. The tube is already inside like a standard tubular. It's not an "Open Tubular" where they take a tubular casing and cut it open and you insert a tube like a normal clincher.
The pressure rating is 115-220 psi, like a normal tubular.
I've tried Open Tubulars in the past and I really liked the feel. So, we'll see how this goes.