Twice I have seen numerous riders participating in the GDMBR while riding the Pioneer Mountains Scenic Byway and in Wise River, MT, which is at its northern end. Don't know how they do it. There is a bar/restaurant there called the Wise River Club. Last time I was there (2016) a couple of them came in and ordered piles of food. A storm had passed through recently and they were wet and cold. (I got snowed, sleeted and rained on coming down from the top.) What I kept thinking was that, from there, they faced a 26 mile climb to the nearly 8,000' summit of the byway. (At least it's paved.) Always wonder if they all made it the same day or if some stopped to camp for the night along the way. There are a few developed campgrounds along the way. Also, much of the surrounding land is U.S.F.S. land, so you can just plop down pretty much anywhere.