27motorhead
Senior Retro Guru
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In your photo the vernier scale is saying it is 29.15mm DIA.
Might be the thickness of the new paint? With front derailleurs you can deform the clamp band slightly by clamping it in a vice (with soft jaws) against a larger DIA round bar to open it up slightly and/or use a longer M4 clamp bolt. The reason to try and open it up more in the vice is to prevent it digging into the paint. Does the 28.9mm DIA clamp sit nicely against the seat tube section profile? If not needs a little squish until it does. Won’t be much... good luck!Thanks mate, will try the 28.9mm fd once again...