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Is that a whole new seat tube down to the BB or did you join it with the old tube part way down? If the latter what’s the junction there looking like?
Eejit-
I replaced 2/3 of the seat tube. Removing the entire thing would be a lot of work as the bottom bracket area is quite busy.
I had an OD31.8mm tube with ID29.8mm. This was perfect for my Zoom 29.8mm seat post that I had no use for otherwise. But because the existing seat tube is 28.6 I had to machine a sleeve I could weld onto the new seat tube that would then allow me to braze that onto the old seat tube leftover.
As @spotter says it is sort of a very long bi-lam
Hulsroy
Cargo bike is ready 4 paint... Again...