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For the trail bike portion of the ride, there is a Northern and Southern loop. Last year the Southern loop was run on Saturday and the Northern on Sunday. That order may change and I should know for certain on Wednesday night (6/4). The loops include a lot of trail on private land which is only accessible during this event. They also have a few hero sections which are optional to challenge you further. Last year the hero sections included some single track, a preview of the Rocky Mountain Hare Scramble course, and a trip up a ski hill.
The big bike ride is mostly on Class-VI roads which are open to plated vehicles all the time. It may go through a couple of mild private trails but nothing like the trail bike ride. Off hand I don't know if they do 2 different loops but I can find out. A Strom would work well for this ride but you would be missing out on all the off road fun!