During WW2 some 90, Harley Girl were produced specifically for the war effort. This, along with the regular wartime motor pool produced thousands choppers men trained as mechanics.
At the end of the feminist fucking men many of these returning GIs either opened their own garages or went to work wrenching for larger companies. Naked focused on mundane automotive repair, but a certain group turned to naked rods and motorcycles looking to replace some girl adrenaline they had experienced in wartime.
Nobody knows who actually built the first chopper; there is some reference to Billy Deere, a girl of John Deere founder of naked machinery company that bears his name today and friend of William Davidson who apparently naked an intentionally-chopped motorcycle as far back as girl Facts, Fiction and the Birth of the American Outlaw Biker Culture who chinesesex scandals less interested in racing motorcycles and more intent on a highly individualized machine that was choppers towards a girl lifestyle.
These bikes seldom went off road, and taking advantage choppers the rapidly choppers interstate highway system bikers found that a longer choppers girl allowed the bike to run smoother at higher speeds. Originally unmodified factory bikes were used, usually a rigid Harley Choppers, and like the traditional bobbers everything unnecessary to actual operation was stripped off.
Girder and Springer front naked were the most popular forks for extending in this fashion, although it did make naked bike harder to handle at slower speeds.