Bullwhip

COUPLED TOURER and SCHWINN TWINN

August 15th, 2008

For Sam I’m making a demountable touring bike with S&S couplers. This one is going to be fully lugged, with front and rear rack mounts for loaded touring. So with the couplers, you need to cut your top tube and down tube and braze them in, so I got special True Temper tubes with long butts so that I’d be brazing to the thick part. Here are some shots of the couplers, and brazing them up to make the tube:

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This frame is also going to use capped seat stays, brazed to the outside of the seat lug, for good tire & fender clearance. Some builders use cast caps, to which we say, bah! They’re heavy and artless. So we take our seat stay and file in a channel; then we braze a section of seat tube scap onto it, and grind it smooth.

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And here are some more pictures of the frame in the jig. You can see the 7 degree sloping top tube and the low bottom bracket for stability.

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I’ve also been working on a tandem rehab for Matt, on an old Schwinn Twinn. I know. That’s how they spelled it. See:

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It’s getting a full repaint, with new fenders, racks and an 8 speed internal hub! I’ll have more pix next week of the fancy components, but here’s the painted frame and new fork:

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This entry was posted on Friday, August 15th, 2008 at 6:22 am and is filed under Bike Building, Bike Repairs. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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Circle A Cycles   |   523 Charles Street   |   Providence, RI   |   401.831.5221
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