The 1937 Indian Four was one of the first four-cylinder two-wheelers ever to be produced. This machine is one of the predecessor of the modern-day, big-bore touring motorcycles, and was one of the most comfortable and long-haul oriented machines of its time. It came standard with a hardtail rear suspension, laced wheels, a dual exhaust system, pull-back handlebars and a single seat. Also, this was the first year when Indian introduced a new engine, an upside-down four-cylinder one, that produced a claimed 35 horsepower at 3600 rpm.