Schwinn's venture into the motorcycle market would last until 1931.

1911 Excelsior Pictures

The 1911 Excelsior motorcycle featured a 30-cubic-inch single engine and a design resembling a bicycle -- not surprising considering it was designed by Schwinn.

Note the fancy "engine-turned" finish on the crankcase.

The Excelsior's rear frame tube took a detour in order to clear the large drive pulley.

Before the advent of modern cables, control motions were transferred by intricate jointed shafts.

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