After William Henderson’s death in 1923, Indian expanded its product line by purchasing the assets of the Ace Motorcycle Company. This provided Indian with a more sophisticated sport-touring machine and rounded out the company’s product offering. The Indian/Ace Four was released to the market in 1928 with the same configuration designed by William Henderson. By 1931 Indian had replaced the Four’s frame with one patterned after the 101 Scout. This increased the wheelbase by 1.5 inches. Indian also redesigned the model’s fuel tank for a more modern look. This model is one truly stunning example of an early Indian/Ace Four.
- By 1931, Indian replaced the Ace frame with the Indian double-downtube frame, upgraded the front brake, replaced the rear frame section with one patterned after the 101 Scout, increased the wheelbase by 1.5 inches, and redesigned the fuel tank, all adding 60 pounds
- Indian also increased the engine main bearings from the Ace’s three to the five and re-designed the pistons and cylinder heads for better performance