INTRODUCED IN 1925, the Super X was the first of a new class of American 45cu. in. (738cc) machines. It was quickly followed into the marketplace by Indian and Harley-Davidson forty-fives. The new model featured a neat unitconstruction engine/gearbox.
Primary drive to the three-speed gearbox was by helical gear, and the engine was mounted in a duplex cradle frame with leadinglink forks. The Super X had exceptional performance and earned an enviable reputation; it is Excelsior’s most famous model. The design was restyled for 1929, receiving the “Streamline” look. The bike shown dates from 1930, the year before it was dropped.
| Model: | EXCELSIOR Super X |
| Capacity: | 45.5cu. in. (746cc) |
| Power output: | 20 bhp (est.) |
| Weight: | 450 lb (204 kg) (est.) |
| Top speed: | 65 mph (105 km/h) |
| Country of origin: | US |