At the end of the 19th century, William Harley and Arthur Davidson have a bold vision for a new form of transportation, connecting a motor to a bicycle. They take on George Hendee's Indian Motorcycle in a classic David vs. Goliath battle, fighting to dominate a market valued at more than 7 billion dollars today, the rivals push their machines to the limit and tap into the lure of the open road, to try and rule the motorcycle kingdom.