[The Crusher - Enhanced Gravel Adventure The Crusher is the ultimate Enhanced Gravel experience offering all levels of rider an opportunity to explore U.P. gravel, two-tracks and fire roads, at their own pace. For some it will be a race, while for others it will be a day of personal exploration and adventure. Originally established in 2014 as the Huron Mountain Crusher, and known for a short time as HAMR, we’ve returned the event to its original format and intentions, while joining the Michigan Gravel Ultra Series.]