Just bought an 05 Grizz, didn't have any trouble with the stock tires until recently. I don't do any deep mud riding, but do often end up climbing over big rocks and logs where I ride. The stock tires seemed to be fine for everything but that as it didn't take long for me to puncture the sidewall on one and have the sharp end of a broken branch punch a hole in another within a week. Thankfully, it wasn't too far from my camp, but I do plan to take longer trips in the future. Do they make tires that would be more puncture resistant than the stock ones? Maybe more plys or thicker sidewalls? Not too familiar with this stuff as this is my first quad. Thanks.