Now Indians were beginning to look like what we think of as motorcycles. Rear suspension was added in 1913, and the fire-engine-red Powerplus appeared in 1916—its three-speed transmission produced a top speed of more than 60 miles per hour. Indian also made lightweight motorcycles in the 1910s, including the Model O twin and Model K, an even smaller two-stroke single.

The successful Chief, Big Chief, Scout, and Prince models dominated the company’s output during the 1920s. The Chief, which retailed for $435 in 1922, was marketed as a bike that could pull a sidecar. And it certainly could, thanks to a powerful 1000cc engine.

In 1923, Hendee reorganized and renamed itself Indian Motocycles (that’s right, with no "r"). One of the first bikes from the newly named company was the lightweight Model L Indian Prince, which was manufactured until 1928.

That was also the year the 101 Scout was introduced. Widely considered to be Indian's finest motorcycle, the 101 Scout had a more graceful shape that the Scout that preceded it, from the curving gas tank to the position of the leather seat between the tank and the rear fender. Indeed, it was a beautiful and powerful bike, with a top speed of 70 miles per hour, but its lifespan was short—much to the chagrin of dealers, the last 101 was made in 1931.

The other Indian milestone of the 1920s was the purchase in 1926 of a 4-cyclinder-motorcycle-maker called Ace. The very next year, Indian literally gave the existing Ace line a new coat of paint, lettering the words Indian and Ace on the sides of their gas tanks. That dual branding was probably the reason why many people referred to these bikes as Indian Aces, even though the bikes were sold as Indian Fours.

The handsome Sport Scout followed in the 1930s, which, despite the Great Depression, was a productive decade for Indian. Among the bikes produced in the 1930s were a three-wheel cargo bike called the Dispatch-tow and several models of four-cylinder bikes (the 436 and 438 were two of the best). Indian also branched out from its traditional red paint jobs, incorporating the profile of a Native American chief in full feathered headdress on the sides of its gas tanks—a speedometer and other instruments were bolted to the top. By the 1940s, Indian Fours were favorites of state troopers, but when police contracts ran out in 1942, production of the expensive machines ceased.

During World War II, Indian made a lot of motorcycles for the military—the Indian 841, designed for desert warfare, is among the most collectible Indians around. The 1940s also saw the launch of several bikes for the general public. Chiefs from the 1940s, both pre- and postwar, had gorgeous cowl-like fenders that gave the bikes a streamlined look (decorative fringe below the seats was optional).

Arrows and Scouts brought the company into the 1950s, which was also the decade when the 500cc TT Indian Warrior and its smaller cousin, the Brave, were introduced. But Indian had perhaps put too much of its wartime attention into military contracts, so its profile with the general motorcycling public was low by the end of 1945. In 1953, after several years of changes in ownership and management, the original Indian ran out of gas. Today, since 2006, an entirely new company produces motorcycles bearing the Indian name.

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