Is 22x11-8 the largest I can fit on this year of lower? It has the bubble over the front tires. Also I won't be using it in water much, would knobbies be okay? What about the knock off strykers with the Chevron and knobs pattern? I'm being kind of cheap but I won't be swimming this machine enough to justify the cost of actual swim tires. Any suggestions? Has anyone tried heating the lower and working those bubbles out to fit a larger tire? I think the extra ground clearance from 24 or 25 inch tires and flotation from a larger tire should help me out. Thanks for any insight.