27.2 isn't ideal for metal frames IMHO.
In a recent project to develop a light alu frame, we were using some nice 7-series alu tubing, which can be down to 0.7mm in certain places and generally between 0.8-1.2mm. The seat tube ended up being really heavy because we had to use 2.3mm tubing (the distance between 27.2 and 31.
. I could easily save 45grams if I could use a thinner seat tube.
Generally 2.3mm tubing simply is too thick for lightweight Alu or Steel (you don't need THAT much material to make a sturdy seat tube). You could put in a sleeve but that adds uncessary weight.
Fast falcons: http://www.youtube.com/watch?v=j3mTPEuFcWk
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