Bike it like you mean it! The George S. Mickelson Trail • 109 Miles • One Day Experience the beauty of the Black Hills from the back of your mountain bike, via the Mickelson Trail.Century Ride: the entire length of the Mickelson Trail ONE day! Deadwood to Edgemont • 108.8 miles Half-Century Ride: from the Mountain Trailhead (near Custer) to Edgemont • 49.6 miles