Just to be clear, they are the BFG Mud Terrain KM
255/75/R17 on the 2013 mineral grey wheel, black side wall (Factory Rubicon setup)
Here's a picture of them on my Jeep (they look a bit small as the lift is on in this picture)
Here's a close up of the little factory Jeep icon on each wheel. Pretty cool.
I didn't chalk test these for diameter, but they are pretty much a 32" tire prior to going on the ground mounted. Most people report a working diameter of around 31".