Tour of the Dragon is not a road bike race or a classic mountain bike race, nor is it a gravel grinder, because it doesn’t fit into any of the categories defined by the UCI. Since the distance of the race is 286km, we would categorize it as an ultra-marathon mountain bike race on roads that happen to be extremely challenging.Tour of the Dragon starts in Bumthang and travels 268 km over 4 mountain passes before finishing in Thimphu. It’s one of the toughest one-day mountain bike races in the world.