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:
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:
Then I mitered the tubes as usual. It’s a welded road bike with sloping top tube. Here are the joints before welding:
Here’s some shots of the frame in the jig, after welding & brazing, and out of the jig:
And here you can see how the entire frame & wheels will fit inside a wheel-size box about 12″ deep:
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!
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