I did this on a Trek Checkpoint with 40mm tires and I felt substantially under-biked. The climb was technically very difficult. Big rocks, big ruts, very steep sections - often all 3 at once. I made it up without falling off, but just barely. I also had to hike multiple times. This may be less challenging for an experienced off-roader, but it was tough for me. Thankfully, the descent was much easier technically, and I had a blast doing that. Still, I'd recommend a mountain bike for the climb, or at least much bigger tires than I had.