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The BGE brand stone is generally regarded as much better than the industry standard stone. I can't recall ever hearing about one of those cracking.
My mistake, I did not catch the 16". BGE has 14" for large and 21" for XL.
Primo has a 15.5" glazed stone: http://www.primogrill.com/accessories.html# -- I would imagine it's intended for the same usage and temps as a BGE.
The Naked Whiz has a good page regarding pizzas that may be what's driving the request for a 16" stone: http://www.nakedwhiz.com/pizza.htm
John - SLC, UT
Webers, Eggs, Bubba Keg, Smokin-It #3
Can anyone suggest a good 16" pizza stone that won't crack under high temps?