Originally Posted by
FBinNY
Maybe I do, but let's not go there.
A single butted tube, such as is used for the seat tube has one reinforced (buttressed) end.
a double butted tube, used for the top and down tubes, is thicker at both ends (and thinner in the middle).
I believe* that a triple butted tube is analogous to a triple butted spoke, where the two ends are of different thickness. So you have 3 gauges, the thicker end, the not as thick end, and the middle which is thinnest.
But no matter what marketing calls it, you can only buttress 2 ends of a tube. (except in 4 dimensional space, where tubes might have 3 ends)
* I said believe, because while I've described one use of the term I'm familiar with, I have no way of knowing what marketing is up to these days.
What "marketing is up to these days" is not thinking about butted tubes, just as they haven't been for the past 15 or so years. In the rare instance where they do have copy to create for a triple butted tubeset, I can't see how they would reinvent the meaning, or to what end; it's not rocket science:
