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Are you saying your friend wants to change the seatpost from the steel version to a carbon or titanium version?
The original Brompton titanium seatpost had issues and recalls before it was discontinued. 3rd party titanium seatpost are fine especially the ones on SJS.
I would avoid the carbon ones as they will wear and break eventually due to the fact they’re not designed for sliding up and down on a daily bases.
Hope that helps.
HoKe
@JAH-tim
On the subject of wants just asking for a friend .... I sorry they ...will at some point replace the seatpost have seen some carbon and some aluminium ones like woodman which would save a lot of weight but the tube is very long so are they all good or are there safety concerns is titanium the one apologies for lack of punctuation and thanks