I am building a cart from (What Type of Tires and Wheels Do I Need to Make a PVC Beach Cart?). I have a wheel whose central diameter is 3 inches and the PVC for the axle is 1 inch in diameter. I am planning on cutting a wooden circle and attaching it to the wheel and cutting a 1.25 inch hole through the center of the wood so the PVC pipe can pass through the wood. Is this a good idea or are there better alternatives?
What may be significantly easier is to make an adapter plate that matches the hole pattern on the wheel hub and a pvc pipe flange. The other really easy thing to do at this point is using a frame from a new four wheeled wheelbarrow. The wheelbarrow is belt from those environment, has roughly 1 ton capacity engineered in and it saves you a ton of time which I would assume is worth way more than the wheelbarrow. I hope that this helps.