[Mike Bradbury]

I finished the wheel sizer enough to get a rough look at it. I still have a bit more material to relieve from the center bore but the time got late so I got it close enough to trial fit.

I had to ensure that the saw blade hub and the EMT rim were in exact alignment So I mounted them on my rotary weld table and did the measurements from there. I also turned a center hub that held the saw blade at 9.25" off of the weld table. I used all thread as stand offs for variable off sets and back spacing. Securing all down to the table it was ready for welding.

The back spacing on the dually wheels are 9.25" on an 8.25" wheel. The wheel sizer is designed to be able to change the back space and off set values. The overall diameter of the wheel sizer is 21.5" which is correct for an actual 20" wheel. I am getting a couple of junk tires from the recycler as a trial fit but a stiff donut of cardboard will suffice too.

As expected the back spacing encroaches on the spring perch. but since I am merely using the perch as a mount for a four bar suspension it should not be enough to modify wheel choice thus far.