The Stansbury front trail is a motorcycle, mountainbike, horse and hiking singletrack trail on the mountains west of Grantsville. Me and Jeremy tried it on Motorcycles today.
Get there by going to 400 West in Grantsville and heading south 5 miles to South Willow canyon. Head west up south willow five more miles (gravel most of the way) to a turn marked "Medina Flats" that takes you to the the trailhead. GPS N40 29.764 W112 34.632. from this trailhead the trail runs north just below the Desert Peak Wilderness area. The views are awesome.
The trail is for the advanced rider with several steep rocky climbs and descents. It is 10.5 miles to West Canyon where the trail ends and you turn around to do it in reverse.
A great trail if you ever get a chance!