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Found Fastback derailleur

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NLeming

'Lil Knee Scuffer
Looking for a proper derailleur for a 67 fastback. Research shows a Schwinn approved GT510?
PayPal ready.

Thanks
 
If it is a very early '67 it would have a non-riveted badge "Sprint" derailleur, otherwise it would have an early Schwinn Approved model with a small barrel adjuster and locknut. I believe the latter will be hard to find.
 
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The Schwinn Sprint derailleur had a jockey cage and wheel change for the 1966 models. The cage design was different in shape and went from the three prong to a two prong and the jockey wheels went from metal to plastic.

This is what Schwinn used on the 66 and 67 models.

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