The previous owner said this could possibly be a Schwinn:
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Greetings, and welcome to bicycles.SE. We recommend that all new users take the tour to get the most from the site. If your tandem has a head badge, a picture would probably help. Is there a serial number on the underneath of one of the bottom brackets?– rclocher3Dec 19, 2016 at 1:24
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2It could be a Schwinn. Is the kickstand welded on? What brand is stamped on the arm of the rear brake? (I'm thinking that Schwinn used Bendix pretty much exclusively, and few other manufacturers did.)– Daniel R HicksDec 19, 2016 at 2:11
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That's going to be a terribly flexy frame to ride, given the rhombus between the seat tubes. Triangles for the win!– Criggie ♦Dec 19, 2016 at 3:42
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2@Criggie there's enough triangles, it's lateral flex and cheap, bendy tubing that's going to hurt. There will be no standing up and pedalling. Well, maybe once...– MóżDec 19, 2016 at 4:00
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I would have expected the parallelogram (not a rhombus, sorry) between front saddle and rear bottom bracket to flex vertically, ie two pair of scissors movements.– Criggie ♦Dec 19, 2016 at 4:25
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1 Answer
It's a Schwinn Twinn. The serial number will be located on one of the rear dropouts, if it's not on either side of the head tube. There are a couple websites that will help you determine the date of manufacture. Judging from the type of tires fitted to the rim, and the shape of the rim, I surmise that the bike has had both wheels replaced at some point, as the bike no longer has S-7 rims and tires, which would have been stock on a Schwinn.
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Good answer - thank you for your contribution to the site. Please keep it up.– Criggie ♦Dec 21, 2016 at 21:49