For Paul Howard, who has ridden the entire Tour de France route during the race itself -- setting off at 4 am each day to avoid being caught by the pros — riding a small mountain bike race should hold no fear. Still, this isn’t just any mountain bike race. This is the Tour Divide. Running from Banff in Canada to the Mexican border, the Tour Divide is more than 2,700 miles — 500 miles longer than the Tour de France. Its route through the heart...