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It's not the seatpost, it's the tubing. To keep standard tubing outside diameters (so you don't have the same problem with front shifters, for example), if the tubing wall thickness changes or construction method changes, then the inside diameter is what takes the hit. This is why you tend to have a number of seatpost diameters closely associated -- 26.6, 26.8, 27.0, 27.2, etc. Those reflect increasingly thinner tubings in the seat tube. That's all. Something had to give.
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