not to speak for humbebe, but i will anyway. for what we went through, those stock tires worked fine. i think the only issue with them would be if we hit some sticky mud, but even then they would probably be ok. (i've been buried with my old BFG M/T, so you never know)the river crossings were mostly gravel, so we werent' getting sucked down into it. I'm sure we'll get her talked into some 35" M/T down the road . . . . .