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Butted tubing was introduced to save weight on steel frames, lugged ones in particular. The thick end was necessary for the brazing process and of course for welding too. They butted AL frames as well. The problem with TI is that the stuff is already pretty light and it's more flexible than steel. The process of butting makes the tubing more flexable. So the builders have to be careful with that and I think you risk a more flexible frame at the expense of less weight. Of course there is nothing wrong with a flexy frame either.
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