It could go either way, I guess. Help the bead slip into the channel easier, or help it squirm out. Any chance you can trim the tire bead, or shave some rubber off it, to make it thinner?
Freddy got the same exact wheel and tire combo together, so I would think there is a way. He's using this combo on a wheel loader project. Maybe ask him if there are any tricks.
http://www.rctruckandconstruction.co...ead.php?t=2980