I believe the stock wheels are 15x7. Manufactures who make 35x12.5 tires like BFG, Goodyear, etc recommend a 15x10 for that size tire for proper wear. I have ran 35x12.5 km2s on a 15x8 and had to daily them at 25psi so i didn't wear the centers out faster than the shoulders. They still handled and felt great on the road. A 15x7 can be done, the air pressure would just have to be run lower.