This trail is advanced tech and strenuous aerobic. This trail involves a few miles of riding on the pavement. Start by heading back down to the intersection with the South Fork of American Canyon and turnig left and climb up the hill to the Pine Hollow trailhead parking(as an alternate you could start here but you really don't want to climb that hill at the end of this ride) look for the trail on the opposite side of the street from the parking lot. Start the brutal climb up the Pine Hollow trail this narrow, rocky and steep after about 2 miles turn left onto the Great Western Trail and follow this up to Ridge 157 trail. Head north on Ridge 157 by turning left and follow this for 2 miles being sure to take the right hand turn at the Mud Springs fork of the trail. Here you will climb up through aspens and then a short fun downhill to the Tibble fork trail. Turn left onto Tibble fork and get ready to drop about 2000' over the next 3 miles and back down to your vehicle.
Head up American Fork canyon behind Mt Timpanogos. If coming up through Alpine make a left on the North Fork of American Canyon towards Tibble Fork reservoir and park at the reservoir parking.
http://www.singletracks.com/item.php?c=1&i=1608