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I used a Deda replacement for one of the Cromor externally butted tubes (not in stock) from Ceeway that had an internal diameter of 27.4 (1.2 wall and 29.8 external dia) pre-brazing that just needed a light reaming to fit a 27.2 post nicely. I'd guess the 28.6 with 0.6 wall would be the same.
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I asked about this on that facebook framebuilders group and someone replied saying that 27.4 id seat tube was for 27.2 od seat post.
Doesn't seem to make sense but there you go!
I'm using the same 27.4 id Zona tube you used on my next frame.
zigbit
M_V
@PhilDAS
Seat tubes with 27.4 ID are gonna fit a 27.2 post after brazing right?
All the 28.6mm seat tubes I'm seeing have a 0.6mm wall thickness