I have never seen an 18-inch Chicago style pizza (assuming you mean the thick "deep dish" kind and not the thin "tavern style" kind). I've had them in a dozen p

I have never seen an 18-inch Chicago style pizza (assuming you mean the thick "deep dish" kind and not the thin "tavern style" kind). I've had them in a dozen places there, but I've neither seen nor heard of one > 14 inches.