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The previous owner said this could possibly be a Schwinn: enter image description here

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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?
    – rclocher3
    Dec 19 '16 at 1:24
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    It 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.) Dec 19 '16 at 2:11
  • 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 '16 at 3:42
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    @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...
    – Móż
    Dec 19 '16 at 4:00
  • 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 '16 at 4:25
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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 '16 at 21:49

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