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PhilDAS
I'm not a framebuilder (yet?), and just out of curiosity, I wanted to ask a framebuilder how modern steel integrated head tubes work. Like, where does the bearing rest on? In the image I attached you see the picture for a tapered headtube, from the columbus tubing website. Is there a ledge inside the headtube where the headtube rests on? Otherwise, I imagine that the hearing would just fall through... The walls are just straight, there is no stopper or some kind of lip...
And how would that even work for different size frames?
I guess that there is nothing special inside of the tube and that it has to be added when you finish putting your frame together.