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It is a very long seat post, how thin can the material be?
I don't get the weight thing, tho.
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Titanium is generally only made in two commercially-available grades, 6al/4va and 3/2.5 (aluminium and vanadium being the alloying elements).6/4 is tubing, 3/2.5 is for plates and solid pieces. Neither is exactly cheap so generally cost savings are in production. It’s a bugger to work with (it’s extremely abrasive and eats cutting tools, for example) so components tend to be pricey, but assuming the manufacturers can get the tubing rolled out to the right diameter there isn’t much to do to make it into a Brompton seatbpost.
Incidentally, most early ti bicycles used commercially-available aviation hydraulic and fuel line tubing, which was only produced in a limited range of diameters, as it was far too expensive to get custom-drawn tubing, and so early ti frames were very skinny.
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lynx
jj72
@Rhobbs
A lot of the cheap ti posts are cheap for a reason, that’s all I’ll say.