Barre Me in Washington
42 miles, 5200 feet of climbing, lots of class 4, resupply in Washington and Williamstown. We started this ride at the Brookfield floating bridge, but you could easily start at Millstone in Barre or in either Washington or Williamstown.
Note: accessing the hairiest class 4 stretch requires riding past a shooting range, but know that you are in 0 danger of being fired at, well, at least if the folks at the range are following the rules. Apparently, the range operates on weekends.