I haven't had a chance to ride these yet so I don't have any commentary.
Location: Santa Fe, NM
Directions: Upper Canyon Road, just past the Cerro Gordo trailhead. Take a right up a steep dirt road. There is a single track that takes off to the left about 100 feet up the road. After that the trail is well marked, with maps at every junction.(from Sangre de Frisco Mountain Works site)