Join Date: Jul 2003
Location: Norfolk, England
Bikes: Orbea Enol roadie, Fly Micromachine BMX, Fort Track fixed
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You should be able to use regular head tube lugs, as long as the top tube meets the head tube roughly horizontal (like a regular frame). The seat tube lug and BB shell are a different matter. You might be able to cold set them, but I doubt it, the angles are just too steep. You would probably be better off fillet brazing these joints. I know you can get a BB shell with lugs for just the chainstays, allowing the down and seat tubes to be attatched at any angle. You can also get seat collars that are 4 or 5 inches long, so the top tube would join the collar, not the tube (see www.ceeway.com
As for the tubes, I've no idea where you could get some, or how to bend straight ones. Maybe ask your local friendly custom motorcycle shop if they can bend tubes.