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As best I can measure, about 27 with the tube walls at 1.4mm. That's odd isn't it? Though writing this makes me think @M_V 's point about external butting might be on the money - these numbers would add up then. If that's right, then I'd need a 30mm clamp and hope that works with a 27.2 post. Just a bit nervous as it's getting closed to the brazing.
adamdenw
M_V
What does the internal measure as?