You can see from this picture that this was a fairly typical section of that trail. The rocks were generally about half the size of my fist. There were sections that were larger rocks embedded in the dirt that we had to pick our way through. The tires we had were Schwalbe G-1 speeds set up tubeless on Gunnar Crosshairs bikes (you can see one of our party in the photo). This was more than we had anticipated on starting this trip - the section here is a veritable wilderness trail. But there were no issues, no flats, no problems at all and the bikes handled well through the whole trip. As you can see, there was some epic scenery to look at as well.