Here's another good loop out of Tucson. Take Redington Road north up towards San Manuel. When you get to pavement again turn left and then an immediate right onto Black Hills Mine Road. This is an alternate route up the back side of Mount Lemmon. Do-able on pretty much any DS bike with a few rocky hillclimbs and some tight switchbacks. Be careful on both Redinton Road and the Lemmon Control Road as people tend to run pretty fast and often on the wrong side of the road. It's really busy on weekends but weekdays are quite pleasant.