This thing is another king of the singletrack world. It takes alot of bike handling to have any kind of fun on this one. I would reccomend it for advanced and above. Do not go before July because there will be too much snow.
How to get there:
From Crested Butte: Drive north up Gothic Rd through Gothic. Park at the Gothic campground and ride northwest on FS317 for a few miles. At Schofield Pass, the 401 trail climbs onto the shoulder of Mount Bellview.