There are quite a few loops in this trail system (17 mi total). The trails consist of: flat to mild grades or gnarly (rocky) downhill action. Restrooms at the parking area. In addition to biking, trails are open to hiking and Horse riding. Around 1000' elevation gain (parking area to top of the ridges)
Parking area 1mile off J59 (east on Chinese Camp Rd). J59 is off of HWY 108 (Oakdale to Sonora) or HWY 132 (Cut across Bonds Flat RD) from Modesto/Merced area. You can see the area maps (Red Hills Ca, via internet).
http://www.singletracks.com/item.php?c=1&i=3705