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« on: March 20, 2017, 04:49:19 pm »
I did the Divide from Banff to Abiquiu in 2015.
The section from Bannack to Lima, Brown Sheep Divide, would probably be OK. Beware, though. In heavy rain, it's impassable. And I mean impassable. When I was riding, I camped halfway up the pass. I awoke before dawn to lightning in the distance. As it's exposed there, I decided it was Time To Go, and packed up and left. It began raining as I was climbing in the dark. At one point, I stopped dead because I had hit a mud patch-- wheels were so clogged with mud they barely rolled. I pushed for a while. As the sun came up, I found a gushing stream and dumped my bike in it. Wheels cleaned, I rode on, crested the pass in crazy half-light that made me feel like I was in a black and white movie, and began flying down the mountain with a huge headwind. I made it through to Lima. Two couples, miles apart behind me were stranded in the mud. Luckily, both couples were rescued by passing pickup trucks. I wouldn't have been-- I saw no one until I got well down the other side.
I don't know what the section from Slater to Steamboat was like in 2012, but in 2015 it was extremely rough and rocky, especially the section near the top of the pass and a long section in the middle of the downhill that made me glad I was riding 3" tires. I suppose it's possible to ride that section on a tandem on 35mm tires, but IMO it would be a terrible idea.
The section as you cross the Idaho/Wyoming border, on Ashton Flagg Road, was washboarded. That was a tough day for me. Again, I suppose that 35mm tires would work, but they would not be fun.
All in all, I would not recommend 35mm tires.