I just opened our shipment from skyway.......
I ordered some of the 9" pneumatic and some of the 9" bead-lock and my initial opinion is forget the bead-locks and go with the pneumatic tires. They are ohhhhh soooo stickey and reasonably light. The bead-locks with the Dupont whatever-it-is tires are somewhat soft but are heavy and do not adhere to the carpet nearly as well as good ole rubber.
I've just designed an adapter to adapt the 3/4" hub in the pneumatic wheels down to 1/2" and will post it in the "Manufactured Parts" library of the FIRST CAD Library.
My only decision is weither or not I want to stick (no pun intended) to my homebrew (sorry: top secret) wheels at 6" or go with these 9" monsters.
hmmmmm......
Skyway Wheels