So I've just replaced my telescopic seatpost to this alloy one that's a fraction of the weight (470g savings!). Yet to take it for a spin, but any major cons I need
Brompton Telescopic Seat Post Silver or Black – PortaPedal Bike
Telescopic Seatpost Snap-Fit Black | Brompton Bicycle USA
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Amazon.com : Titanium Gooseneck Seat Post for Brompton Bicycle Saddle 31.8mm Folding Bike New Type Rod 550/580mm Gr9 Ti Accessories (550, Gold Color) : Sports & Outdoors
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Brompton Telescopic Seatpost Pillar – Joseph Kuosac
Amazon.com : Brompton Black Edition Standard SEAT Post,2D-INYI-CB3A-TR : Sports & Outdoors