The Porcupine Rim Trail in Moab, Utah is 15.6 miles in length, requiring expert technical skills, this ride is for the advanced riders who are in good shape.
It's one-way with a shuttle car, or a 34-mile loop for the truly insane (10 uphill miles from Moab to the trailhead, 8 flat miles from Jackass Canyon back to the middle of Moab).
The Porcupine Rim Trail begins on the Sand Flats Road, reached by turning left off Moab's main drag onto 300 South, then right when the road ends, then second left. From the entry gate, drive 7 miles. The trailhead is on the left, near the small cattle-watering tanks. (Leave your shuttle car in Moab, or at the Negro Bill Canyon parking area on highway 128 north of Moab.)
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