With its Ashtabula one-piece crank and Huret Allvit derailleurs, many customers probably didn't know what set the Super Sport apart from the cheaper Varsity and Continental models, and many dealers probably didn't do a good enough job explaining what made them worth the extra money. The Super Sport was placed above the welded Continental model in the Schwinn model lineup, but below the slightly more upscale Superior or Sports Tourer (depending on the year). Unlike the bulk of Schwinn's bikes of the time, which were welded together with heavy seamed steel tubing (made in-house at the Chicago Schwinn factory), the Super Sport and its stablemates, the Superior and Sports Tourer, were fillet brazed by hand from straight-gauge chrome-moly tubing in the same corner of the factory that produced the top-of-the-line Paramounts. It was one of the lovely and under-appreciated hand-built bikes from Schwinn.
I've written about bikes like the Super Sport here in the blog before ( HERE).