[MrForbes]

I was thinking about how to drive the "wheelbarrow" wheels, which have a tube with bearings in the ends. My idea is to make a steel hub, with an ID the same as the OD of the tube, and a 6 hole bolt pattern to match common robot sprockets. Tack weld the hub to the tube.

But I haven't actually done this yet! and I have some equipment that other teams may not have access to, although I think you could do it with nothing more than a hole saw and a drill press and hack saw, if you needed to. Oh, and a MIG welder, although there are plenty of shops that could weld something like that pretty easily.