While doing some research on interesting endurance races, I came across the Great Divine Race (GDR). Have you ever heard of it? Is a called the greatest most challenging MTB race in the world. It starts at the north Canadian border and it ends at the Mexican border. It takes over 20 days to complete and the only rules is for the rider to not have any outside support.
I found the reading of this race very intersting and I hope you do too. What was more interesting to me was the choice of bikes these guys have. Most of them have hard tails. I guess is because of most of is on country dirt roads. I doubt there is much bumpy singletrack involved. A few riders with single speeds. ONe guy on cyclo bike and one guys who just a bit odd. Ridgit bike, fix gear, and no chamois on his shorts.... Hmmm, I hope he finishes. Anyways, here is one pic of the riders at the start. Check out the other pictures so you can see what kind of gear you will ever need to be out in the country doing 20 days of riding without any support. Well, I guess you are allow to stop in towns and eat or pick up stuff you need. But you see guys filtering their own water, carrying sleeping bags, pepper spray for bears and many other things... Enjoy...http://www.adventurecycling.org/gdrgallery2007/