drive around garbage day and pick up old push mowers for the wheelsI was thinking about making my own wheels for a couple of chicken tractors but I'm not sure what I'd use for the tread. I have some 1.5 inch flexible black poly water main line that I scrounged for free. Maybe I could split it in half and screw it on and have a more rounded tread profile. I could use 1/2" or 3/4" pex as bushings. I have both.