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Join Date: Mar 2012
Location: Niagara Region, Canada
Posts: 1,457
Bikes: 1970s Alex Singer, 1960s Peugeot PX 10, 1960s Bertin C37, 1973 Carre Bertin C 37, 1972 Carlton Kermesse, 1981 Peugeot PX 14 Super Competition
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kepohe -
Try and get a framebuilder or a bike shop familiar with steel framesets to ream the seat tube and then hone it. Make sure the points of the seat lug are smoothed off to prevent scoring on the seatpost. Have the framebuilder check the seatpost opening after reaming and honing using a seatpost gauge which should confirm the actual, round, opening of the seat tube. I suspect you are right and that it will be 27 mm once cleaned up..