Sugarloaf Trail is a long west/east traverse with Sugarloaf Mountain in the middle of it. It maintains its elevation fairly well and gives you a taste of several riding surfaces from start to finish including old road, cow trails, a bit of gravel, and unintended ATV doubletrack. For the most part it is singletrack though. You would likely want to pick it up somewhere in the middle and do something fun with the ending of your adventure.
There is only a very brief stretch of wilderness where the trail teases the wrong side of the watershed line, but we're still going to feature it here as a mountain bike trail, in hopes that the Forest Service will eventually make a logical interpretation of the Wilderness Act. If nothing else, the trail runners and horseback riders can use this information. In fact, why not just take a mule train through there because it will help blow out trail. It needs more use.
There is a short section of road at Russel Mt. Lookout. It is there that the trail is #1887E which is the Twin Lakes to Deadman Trail section. However, since it is a climb with old road and difficult cow trail to follow from Twin Lakes, it might be better to just start this trail at Russel Mountain Lookout. Trail 1887W (Deadman Trail to Blue Creek Saddle) is a bit more compelling of a trail, although at times it is ATV doubletrack.