This trail is great. It is not as rocky as other Phoenix area trails( ie: Trail 100, National, Estrella Mtn Park). Twisty singletrack on rolling contour. The surface consists of small pebbles which make a nice ripping sound as you careen through the turns. These are one way loops, there are three total. The sport, technical, and long loop. Distances are ~ 3 , 3 , 6.5. Enjoy.
From Phoenix area, get on the 101 and head to east side of loop( either N or S) . Near Scottsdale take the Shea blvd exit and head east towards Fountain Hills. Take a left on Mcdowell mtn park road and go approximately 10 miles. Take left in to park. Sign reads competitive track. May have to pay; 5 dollars on weekend. Trailhead is up road on left few hundred yards.
http://www.singletracks.com/item.php?c=1&i=1085