Thank you for your input, then I will go with the 27,4mm ID.
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Hello,
i have got another question, what material would you recommend if a want to make a sleeve that fits on the end of the seat tube?
Because I have two seat tubes which are not buttet on the end I thought I could make a sleeve which fits on the end weld it together.
So I could use this two tubes, could I use normal 1.0254(ST37) or should it be 25cromo4?