Do you have to use 2x1x1/8" tubing for a WCD?

[Hawiian Cadder]

We used 3 by 1.5 by .125 tubes this year for our WCD. They were pocketed with 2 inch diameter circular holes. Rather than slide our bearing blocks rotated in place, having 4 discrete positions to both tension chain and achieve proper center drop. We did this because it moved fabrication resources onto the frame that would otherwise have been devoted to the bearing blocks. We also used the larger tubes because they work a bit better with the rivets our team favors. In short, choose a tube size that works for you, smaller tubes favor teams that weld and use smaller wheels, while larger tubes favor rivets and gussets with larger wheels.