Can anyone confirm whether the 5" casters are swivel casters (meaning they can point in any direction), or fixed wheels (such as the skyway ones mentioned above)? If they are fixed wheels (that can not rotate) then I think, given there are three, that it is definately something that rotates about a pivot point in the center, such as a carousel. The wheels would be tangent to the circle. I sure hope not, I really really hate carousels
But can you imagine robots fighting not to be thrown off a rotating carousel?
[Edit]I bet these wheels are swivel casters. McMaster #30305T14. 5" diameter, 2" thick. $21.78 each.[/Edit]
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