Southeast of Tucson, the region around the abandoned town of Greaterville in the Santa Rita Mountains has many old roads and trails.
To reach the mountain biking trailhead from Tucson, follow US10 east to US83. Proceed south toward Sonoita for roughly 19 miles. Take a right heading west on FS 62/229. Follow the pavement for 2.5 miles. Veer left on FS229 heading southwest towards Greaterville (and Melendrez Pass). Continue on past the ranch house and corral on the right. Park near the cattleguard at the summit overlooking Greaterville.
The mountain bike ride begins across the cattleguard where the road is now FS162. At 0.85 miles, veer right (FS165?) near sign for Melendez Pass/Greaterville/Kentucky Camp. Pass turn offs for FS3049 (2.35 mi.) and FS4040 (2.75 mi.). Before reaching the radio towers on the right at 2.85 mi., turn right onto FS4043. At 3.7 miles near cattle watering tank, follow rough trail behind down a wash (dry creek). At 4.2 miles, turn left out of wash uphill onto old road (FS4043?). Pass overhead power lines at 4.6 miles and Wisconsin Mine (?) at 5.1 miles. At 5.7 miles, cross gate and stay to right on the less worn path at junction. Pass two gates at 6.4 miles and stay on the rough path along the fence until reaching a major road (FS62). Take a right heading south. At 6.7 miles, take a right onto FS229 and mountain bike ride past the ranch back up to the car.
Keep an eye out for jaguars, which have been reported in this area.
Overall, Greaterville Trails is the 78th most popular mountain bike trail of all 103 mountain biking rides in Arizona.