That is just what I was looking for, to ride on the Dempster Highway up in the Northwest Territories, Canada. The highway is gravel, 480 miles or so long, and they use sharp and pointy slate rock for some reason. I drove it in my VW and kept getting flats, but ive always wanted to ride my bike to the end at Inuvik. Ive seen others on their bikes. You would need to bring a trailer full of spares.