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@edscoble
Titanium aren't always the lightest, a triple butted titanium frame for example weight 1400kg, but cost over a thousand quid, whether a normal 7005 alu frame weight only 100kg more and a lots cheaper, even £300 (spes langster's frame weight that much).
the reason people went for titanium is because of the ride quality, whether alu is stiffer.
an alu seatpost will be just as light as titanium, frankly, a titanium seatpost isn't necessary on the brompton.