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800-626-2811 When your derailleur goes into your spokes it may not only destroy your frame, but it may end up destroying your wheel, derailleur, and derailleur cable and housing.
In really bad cases it will destroy your chain as well. There are two possible reasons; improper adjustment or a bent frame (derailleur hanger).
If you bought your Schwinn at a big box retailer or sporting goods store, please see the information directly below.
The code dating does not decipher which decade and maybe someone knows how to tell but I have never seen any thing on that.
So if the fast back tires were still being made in 77 it could be either one 77 or 67.
Sometimes the hanger is removable and replaceable, but not on all bicycles.
When the derailleur hanger gets bent it misaligns the whole derailleur system.