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the Superior model is one with a long off-again, on-again history
following a hiatus it relaunched as a 1962 and was once again withdrawn following 1963
it relaunched as a 1976 model and was again discontinued following the 1978 model year
the Super Sport model has the fillet brazed chro-moly frame and forged ends but has the Schwinn one-piece chainset
the Sports Tourer model launched as a 1971
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since you are located in the UK one detail you might want to be aware of if that the seat tubes on these are slightly oversize - larger than 28.6mm
this means that Schwinn had special front gear mechs made for them by Huret
finding one of these special mechs separately in the UK could take some hunting
some home mechanics here on the forum have written that they were able to adapt a standard front mech designed for 28.6mm tube to fit; have not done it meself so cannot comment
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one minor advantage of the Superior model of 1976-1978 is that it lacks the heavy Schwinn steel brazed-on propstand
AFAIK it is the only model you mention which has this plus
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Last edited by juvela; 04-26-24 at 08:10 AM.
Reason: addition