Well, I'm fix'n to upgrade the tires and wheels on my 500. I ride in everything from the mountains in Colorado to the swamps in south Arkansas, but mostly I ride around on dirt roads, gas pipelines and farm roads around my home and farms. Looking for a good all round tire, probably 26 or 27 inch. Have been looking on line at Maxxis Vipr and the Sedona Rip Saw. Anyone have any experience with either of these, or recommend something else?