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"Imitation is the Sincerest Flattery" Show you're Schwinn rip offs.

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OK that is a great looking light weight. What is a Super Sport?
An SS is a hand brazed model from the 60s and 70s. One of my favorites.

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http://thecabe.com/forum/threads/double-curved-bar-schwinn-frames.10776/#post-50418
If Schwinn began production of their arched parallel twin bar roadster frame in late 1935 they were with the tide. The earliest production version of the “rainbow” design for a balloon frame might go to Colson with versions of the Aristocrat line featuring parallel upper and lower top tubes for their 1935 line which was presumably developed at the end of 1934. If Colson felt the need to initiate an infringement suit against Schwinn over the top tubes, at least they didn’t have to fight anyone for stealing their three bar fence residing at the bottom of the Aristocrat’s main triangle.

Dating the Schwinn design to late 1935 may place it second in line but by or before the end of 1935 Huffman also had curved the lower bar on its Moto-Balloon creating a rainbow and CWC, Snyder, Huffman, and Shelby (although the bifurcated top tube differentiates the Shelby from the pack) all had rainbow frames in their 1936 catalog lineup. Shelby did offer a truer rainbow frame later and Huffman, Iver, and even Emblem got on the bandwagon during 1936-1937. Monark was a latecomer with a few steel rainbows pushed out the door around 39 or 40

The only major firms that did not produce rainbows as far as I know were Westfield and Mercury.

The design itself is an obvious and simple enough revision of a moto-bike frame adding streamlining to the frame without entirely redesigning the frame. If the rumored lawsuit story is true it could be that Colson took umbrage at the Schwinn design and went after a desist action. By the time the industry was awash with similar frame it might have been decided to leave well enough alone. Through a couple of general redesigns Colson stayed with the rainbow design through 1939 and kept producing it as a second tier model until WW2.

Most other companies moved on to more streamlined frame patterns by 1939 so the joke may be on Colson if they wasted money on a suit against Schwinn. Schwinn obviously continued to produce the frame until at least 1938 by which time the design was generally outmoded. It is also obvious that it was not the most popular frame in the Schwinn line so discontinuing it was probably not too painful over all.
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