Found this on Sram.com in the service section, under Frame fit specifications - X0 X9 X7 X5 - MY14. Looks like 2013 is going to be a good year for being fat.
Service Resources - SRAM | SRAM
See Page 21 and page 26 for X5 Fat Bike Crankset
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Thread: X9 Fat Bike Crankset
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