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Seems like I've been sticking verniers down seattubes and measuring a 27.2 tube and fitting a 27.2 post for years?
The 2 frames I've built so far have had seat tubes that worked out to 27.0 id (28.6 od minus 2x 0.8mm wall thickness), 27.0 seat posts have been a nice slip fit in the bare tube pre brazing so post brazing I've reamed to the point where the 27.0 post would fit in again.
You reckon I'd have been better with 26.8 posts in these seat tubes?
M_V
You need .1 of clearance for the seat post to actually slide in, otherwise it’d be a press fit