I am not saying he shouldn't do it ,I am saying he needs to use the same size tires in the back. Put the oddball in the front. It may not cause any TOD issues. I have not tried it so I do not know. I do know that the smaller tire should be on the front. If it were me I would run a little more pressure in the oddball tire to make it the same diameter as the others and then there will be no issues. shawn