Headed out for a nice night ride in the Marshall Mesa area. Sun was starting to set nicely over the peaks. Sun setting just after Mayhoffer/Singletree Dirty Biz loop plus trails on west side of 93. 2:26 and just under 22 miles. About 1200 feet of climbing on the loop. Not much at all which means faster speeds and ability to push a little on the short climbs. Back side of Spring Brook loop is highest point.