Originally Posted by
JohnDThompson
Not sure about the new SL, but the old Japanese "triple-butted" tubes added a butt where braze-ons were likely to be placed.
That's interesting, John.
Ishiwata used the term "triple-butted" to describe tubing that had
different wall thicknesses at the butted ends (T1 and T3 in the illustration below).
Columbus seems to use it to describe any tubing that has three wall thicknesses, e.g. end butt/center section/end butt, even if the end butts have the same wall thickness. IOW, Columbus describes tubes most of us call "double-butted" as "triple-butted".
Miyata claimed its tubing was triple-butted in the same way Ishiwata did.
