Bullwhip

KIPP’S DEMOUNTABLE

March 30th, 2008

Another first! We can’t stop! Local man-about-town Kipp wanted a bike he could take on planes and in trains, so for him we’re doing our first demountable. We’re using S&S Couplers, lovely stainless doohickies that allow you to break your full-size frame into two pieces! And then put it back together again! It’s true! Here they are:

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So using these require that we take the top and down tubes, cut them in two, and braze the couplers in. I got True Temper tubes with extra-long butts (yes, we like big butts) so that I’d be brazing the couplers in the thick section; then I had to make a jig to hold the two sections of tube in line during the brazing. Kipp got this 80/20 which allowed us to jig it up nicely. Here are some shots of that, and yes those are lengths of old innertube holding the sections in place:

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Then I mitered the tubes as usual. It’s a welded road bike with sloping top tube. Here are the joints before welding:

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Here’s some shots of the frame in the jig, after welding & brazing, and out of the jig:

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And here you can see how the entire frame & wheels will fit inside a wheel-size box about 12″ deep:
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Room to spare, and that’s a bike with a 58cm top tube! Next up: Kipp’s complete bike, & Steve’s single speed cross bike!

This entry was posted on Sunday, March 30th, 2008 at 10:19 am and is filed under Everything Else. 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.

3 Responses to “KIPP’S DEMOUNTABLE”

  1. Apples says:

    March 30th, 2008 at 2:48 pm

    Is Kipp springing for that super fresh fork too?
    I hope so!

  2. Bullwhip says:

    March 31st, 2008 at 1:07 pm

    You smartass. Ok, yes, I used a fork that was damaged in shipping just to show how it all fits in the box. Kipp, in fact, will be using a Ritchey WCS which is super fresh indeed.

    Don’t make me ban you. I’ll do it.

  3. tom says:

    April 5th, 2008 at 1:27 pm

    lookin’ good. how easy is it to demount? is that right? demountable means takapartable right?

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