Yep stock highway tires, didn't have any trouble at all even climbing up huge boulders, even the wranglers with huge tires were struggling. This was at George Washington National Forest in Harrisonburg, VA. Awesome mountain trail. I used 4Lo the whole way with ESP off in 1st gear on 25psi tire pressure. couldn't be happier with how it handled the trail. The only thing I wish I had was taller tires since my axles and skid plates took a minor beating. only hit a couple rocks, but everythings still ok, no damage...PHEW!