This trail is a combination of a network of trails. I rode it counter clockwise. I starts out with the Gould Rim, then on to the JEM trail, and finally to Hurricane Rim. This is a great intermediate ride. Very fast, rolling hills. Not a lot of climbing. If you dont want to do the whole 21 miles, consider just doing the JEM trail out and back.
Description from justin70:
This trail is a combination of trails. It is usually ridden counter-clockwise, so that the JEM trail is ridden down-hill. There are a number of trail heads that can be used.
By doing the whole network (Hurricane Rim, Gould's Rim, JEM Trail), you get a 22 mile epic cross country loop.
I recommend parking at the Virgin trailhead for JEM - that way, you get to finish the ride with JEM, which has the best flow, is the funnest of the three, and is primarily downhill.
Turn right off of State Road 9 onto Sheep Bridge Road just before you enter Virgin, Utah. Cross the Virgin River and take the first right after the cattle guard. Follow the two track to the end (this is the trailhead).
Start riding going west on the Hurricane Rim, which has the most technical bits and the biggest climb. Transition to the Gould's Rim, which has some tech, some doubletrack, and some flowy BMX-style ups and downs. Then finish with the JEM, which is a mostly big-ring affair, except for the one very technical drop from the top into the wash.
This trail as a loop demands respect. It includes rocks, distance, desert weather, vertical exposure and remoteness. Take adequate food, water and spares and ride with care.