I build two frames using the horizontal head tube as main pivot tube and it works well.
Use a 44mm headtube and two top bearings sets.
That bike was built with no jig or mill or machine tooling. Hacksaw, files, vise, and some straight lengths of L channel.
Use a 44mm headtube and two top bearings sets.
That bike was built with no jig or mill or machine tooling. Hacksaw, files, vise, and some straight lengths of L channel.