Framebuilding Jig

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  • Selling my framebuilding jig as ive upgraded and dont have room for two. Its basic but does the job well. Based on the design used by cobra and a few other fixtures with a fixed head tube and angle adjustment in the seat tube support and axle height.

    Ive built tiny 650c frames and cargo bikes as well as large progressive mountain bikes so unless you need to build an mtb frame for someone who is 7ft2 i think it covers pretty much all geometry options. It comes with 120/130/142mm dummy axles and i have some steel stock to make more which ill throw in. You can use 44mm or 34mm head tubes, takes two mins to switch out the head tube holding puck. Seat tube support will do 27.2-31.6 without changing the cone. You can also use 68 or 73mm shells by changing the spacers behind the bb, again only takes a minute or so.

    Its small and fairly light so can be moved pretty easily. You can separate it down into small ish bits and could fit in a small space when not used. I tig weld so theres no melted bits or flux everywhere. The only thing it doesnt come with that you need is a digital angle gauge for the seat tube angle set up but they can be had for 10ish quid online. There are some 3d printed parts so if you were brazing you would have to be wary of where you point the torch.

    I can show you how to set it up, its not hard at all and just takes a few dimensions, the one drawback of this style of fixture is there is a tiny bit of maths to do in setup, however i just made a spreadsheet and input the values each time, so its not difficult and avoids errors.


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  • I'm interested. I'll pm you now.

  • I'll drop you a PM.

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Framebuilding Jig

Posted by Avatar for Biggles567 @Biggles567