Brompton Hacks | Not a hack but a mod with suspension seatpost on my brompton couple with a Joseph Kousac telescopic seatpost lower half (which take standard 27.2mm di...
SM SunniMix Bike Seat Post Aluminum Alloy Extra Long Tube 23.62inch(600mm) Replacement Bicycle Seatpost φ 31.8mm for Brompton Folding Bike - Gold : Amazon.ca: Everything Else
Extended Height Seatpost Black | Brompton Bicycle USA