Hi, I have a customer who wants me to build a steel hardtail around his ZS44/ZS56 Chris King Inset 2 headset. Haven’t seen any head tubes from my usual suppliers - any suggestions? Or anyone sitting on one that’s surplus to your needs?
Steel head tube, that is… will be fillet brazing not welding.
I don’t have one, but I am curious, does one of these headtubes actually exist?
Firefly welds on a lower cup:
Prova has a custom paragon IS56 lower headtube that they weld to a 3D printed upper bearing seat and lug:
Tell him to use a different headset That’s a ridiculous size for a steel frame.
Well, I agree fully - but if I can’t source the head tube then he’s going to have to change! Agree on the huge size, I find even 44mm kinda fat looking on a steel frame.
If you need help to convince your friend, you can quote me:
“Sorry, It does not exist.” - Daniel
But in all seriousness, I couldn’t find anything. Chromag uses an IS56 headtube, which was the closest I could find (paragon makes one too). As @manzanitacycles says, there is no good reason to use a ZS56 headtube on a steel bike. That lower diameter is MASSIVE. You are typically using a 38-40mm downtube. A ZS56 lower HT would be almost 60mm in diameter.
I’ve got some if you’re still looking. How long?
Huh. 100mm. Where are you located? PM me, thanks.
And in case anyone else wants to see:
115mm with top finished:
150mm, cut to size (minimum ~90mm), finish with a silvered on reinforcement ring if desired: