"Located in the eastern slope of the Sandias off the Crest Highway; about 30 miles northeast of Albuquerque. This ride offers incredible views, crosses several intermittent streams, and travels through beautiful alpine forest, but you must be up for the challenge. The sections of good singletrack come at a high price. Much of the trail is expert only (or walk it!). Faulty Trail must be reached by other trails, which is part of the adventure. Canoncito Trail goes straight up a ridge following a stream to its source before reaching Faulty Trail, but you may find the travertine pools are worth the time off the bike.
Faulty Trail traverses East Mountain about midway up along a geological fault line, hence the trail's official name. No one is sure who cleared this trail in 1975, so it was once called Mystery Trail. The mysterious ones slashed diamond shapes on the trees to mark it, so some bikers still call it Diamond Trail. Note: While this loop takes you out Bill Spring Trail to Doc Long Picnic Area, an extension, Oso Corredor Trail, at mile 4.8, connects you to 10K-Tree Spring Loop and rails at the Sandia Ski Area. 6 miles on singletrack, 1.2 miles on dirt road, and 5.6 miles on pavement."