The Knucklehead, Panhead, and Shovelhead are all important parts of Harley-Davidson history, each preceding the one before it as the engines developed.
The V-twin is a core element of the Harley-Davidson story. Here's the history behind Harley's most important V-twin engines ...
The official, by-the-book definition of a chopper motorcycle tells us we should be dealing with a two-wheeler with drastically altered steering angles, long forks, and an overall stretched appearance.
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