Production years: 1925, 1926, 1927, 1928, 1929, 1930, 1931, 1932, 1933, 1934, 1935, 1936, 1937, 1938, 1939, 1940, 1941
William G Henderson was killed while riding one of the new Aces, in 1922, when the Ace Motorcycle Company was about to launch the new Sporting Solo model. Because of his death, the company's assets were sold in 1925 and finally, the entire projects were taken, in 1929, by the Indian Motorcycle Company which modified and updated the Four model until 1941.
|engine specs||Type:||Inline four cylinder, air cooled||Displacement:||1265 cm3||Bore X Stroke:||2.75x3.25 in OR 70 mm||Compression Ratio:||-||Horsepower:||16/0 KW(hp)/RPM||Torque:||/ lb-ft/RPM OR 0 Nm/RPM||Fuel System:||Carburetor|
|transmission specs||Gearbox:||-||Clutch:||-||Primary Drive:||-||Final Drive:||Chain|
|chassis specs||Frame:||-||Front Suspension:||-||Rear Suspension:||-||Front Brake:||Drum||Rear Brake:||Drum|
|dimension specs||Overall Length:||-||Overall Width:||-||Seat Height:||-||Weelbase:||-||Ground Clearance:||-||Weight:||375 lbs OR 170 kg||Fuel Capacity:||3.7 gallons OR 14.0 L|
|power system specs||Power pack:||-||Nominal Capacity:||-||Maximum Capacity:||-||Charger type:||-||Charging time (normal):||-||Charging time (quick):||-||Range:||-|