You said it's a 245/75/16. That's not a 31.If you'll consult official goodyear sizing charts, you will find they are indeed the EXACT same diameter as tires labeled 31x10.5
http://www.tirerack.com/tires/tires.jsp?tireMake=Goodyear&tireModel=Wrangler+DuraTrac&partnum=475QR6WDTOWLV2&vehicleSearch=false&fromCompare1=yes
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