Northern States Ride 2016

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Knuckle Saloon, Sturgis, South Dakota. Knucklehead is the nickname for the two-cylinder, 45 degree V-twin engine manufactured by Harley-Davidson from 1936 to 1947. The knucklehead valve covers resemble knuckles on a person's fist.

All images copyright © 2016 F.W. Vollmer and may not be used without permission.