This is a big-bike friendly albeit big-bike challenging route from Easton to Cle Elum. It’s one of my favorite rides because of the diversity of terrain, loneliness of the route and damn fun riding.
I’d say it’s best for intermediates and above. Some parts of the middle section of two-track are rocky with well-spaced water bars that make fun jumps. There is an easy (6”) creek crossing.
Near Easton, I have included a very short alternative route on an unnamed road that parallels Tucker Creek. This is a really fun and relatively short section of narrow double track. The most technical part is the multiple small stream crossings. There are steep, five foot climbs out. You have to commit, don’t be in the backseat and give it some gas! A lot more fun on a smaller bike.
Make sure you take the slight detour (NF1600 – Little Bald Mountain) to the photo waypoint around mid-ride. It’s a great lunch spot and has an absolutely stunning view of the valley 3000ish feet below. Same goes for the FR 4510 photo waypoint as you approach the descent into the Cle Elum area. ~250 miles.