This is a wide trail that probably averages 3-4 feet in width. It is very well maintained and marked. There is a loop with an offshoot to the peak. There area number of very good views. The trail involves a lot of climbing. If you proceed West there is another trailhead that passes a road an connects to another system. The next section of trail after the road is a good ride as well. After that (further West) it becomes very sandy and I will not ride that section again. If you proceed East from the Redbird Trailhead there is another section of trail with another 5 miles of trail or more. Again, there is a lot of climbing but very good views, including of Devil's Gate. If you don't like climbing this trail is probably not for you. But I went up to Johnson Peak from I belive a clockwise direction, and the downhill and Johnson Peak is extremely fast and reminded me of a pump track in one section. I enjoyed the system and it reminded me of riding in Idaho with the topography and rocks. If you go to the Possum Kingdom Trailhead (on the East side of the system off LaVilla Road, there are restrooms).
From Graford take 16 South for about 4 miles to Park Road 36. Follow Park Road 36 for about 4 miles and it will veer left. Shortly thereafter turn left onto Redbird Road. There is a Redbird Trailhead. From there ride maybe 50 yards West back across Park Road 36 and trailhead to Johnson Peak Trail is obvious.
http://www.singletracks.com/item.php?c=1&i=5391