Cindy from Perkins, Oklahoma on 6/6/2018 11:56:15 PM:
We just completed the entire route on bikes. Two of our group were on gravel bikes, and the other was on a touring bike. We were self-supported, so were hauling all our gear. The entire trail is mostly hard-pack gravel. A couple of miles at Norfolk is paved. We had little trouble. I would advise against roadbike tires.
I'm working on a blog that details our route. Hope to have it all up by tomorrow.