Here in Az, not too much mud, usually hard packed dirt. Did you have the same size tire on all 4 corners too? Did you use the front rims? That is what I used. Have you popped a tire bead going down that low on psi?Those things wear like Iron! Not the best in muck and mire but for Utah trails they are perfect!! I been running the same size for a couple thousand miles now, lots of dirt road a little pavement and tons of rocks, no problems except I'm wanting to go with 32" next time as they run small and I run low air pressure 8psi rear 6 front.