No. 21 wide by 17 deep. There's also the question of whether it gets
hot enough for good take-up. The tire doesn't just have to fit, it has
to be a little undersized when cold so that it loads the wooden parts in
compression--that's where the strength of the wheel comes from. 500F
will give about a quarter inch of expansion with low carbon steel, red
heat will give close to a half inch. The various 1800s and early 1900s
blacksmithing journals suggest that the iron in use at the time would
expand more than this.

By the way, the large pizza from the big chains is 14-15 inch, the
independents may go 18.



Clear a spot on the ground and pile some charcoal over it. Perhaps use old
bricks to shore up the outer diameter of the pile. I don't know if this
violates your 'no burn' statute, but you could say you are roasting a goat.

Judicious use of a high output propane weed burner would eventually work as
well.

-Bruce