Thicker wall thickness means a smaller hole. All steel seat tubes are 28.6mm outside diameter. Frames thy take a 27.2mm seat post have 0.7mm wall thickness. Frames that take a 26.8mm seatpost have a 0.9mm wall thickness. For a stout, reliable bike like an Atlantis which should last for 50 years, it makes sense. Not that they had a bunch of failures with thin walled seat tubes....
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