Did a preride last week of a 55 mile gravel grinder route across what really is remote country in the continental United States. A buddy and I are hosting the inagural Huron Mountain Crusher, August 24th.
There's going to be more mileage options next year, this year only one distance. The "Crusher" portion of the route is quite stout, and portions of it can be seen in the video.
Upper Peninsula gravel = rocks the size of a football.You can see some of it parts of the crusher in the video.