You need to take the bike to a LBS to see if it can be converted. If it was built as a single speed it is entirely possible you cannot change it. If you can change it, you will need a complete build kit (derailleurs, shifters, cranks, chainrings, cassette, new hub possibly, cabling, etc.) which may cost almost as much as a new bike.
You do not want a single speed tandem, so if you cannot convert it, it won't be worth much.




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