Introduced in 1920, the 37 cu. in. Scout was a brilliant new design that resulted in record sales for Indian. To capitalize on this sales success, a larger capacity model was released in 1922, the 61 cu. in. Chief. To compete with the Harley-Davidson big v-twins the 73 cu. in. Big Chief was announced the following year. With a new frame complete with sidecar attachment lugs, Indian finally had a versatile touring model that could compete with anything on the market.