I can tell you from experience that a 22x12x9 WILL hit your exhaust when you bottom out the suspension. I personally wouldn't go any bigger than a 22x10 on the rear purely for clearance purposes. When you smash a tire against a can it bends the **** outta the can mounts and in my case it ripped the can open at the mount. Now if you inflate the tire so it looks like a donut it will clear but if you run low pressure so the tread on that bear claw is flat you will have issues. My neighbor has 22x11x9 mud machines on his warrior and his barely hits the exhaust on landing. He bent his exhaust in for clearance and it still rubs.