Metacortex
Wore out three sets of tires already!
That is weird that Schwinn still used the Sprint derailleurs with all the other parts marked Schwinn Approved... Seems like a lot of odd stuff in those days. My 69 is the same bike, but with the Schwinn Approved derailleurs and (new for 69) brake safety levers.
That is strange. According to the Jan. '68 Reporter the new Schwinn Approved derailleur was being used for '68, and may have made an early appearance in late '67. Now that being said I have seen *some* '68 bikes with the later style Sprint derailleurs (with stickers and plastic rimmed pulleys) like this S/S Tourer.
It may be that Schwinn continued to use up an inventory of Sprint derailleurs on certain more limited production models, especially earlier in the year. But even that doesn't account for a several-year older rear Sprint derailleur with a riveted badge and steel pulleys?