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?– rclocher3Commented Dec 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 HicksCommented Dec 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 ♦Commented 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...– MóżCommented Dec 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 ♦Commented 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 ♦Commented Dec 21, 2016 at 21:49