This is by far the best and most comfortable ride option for a Brompton. It even makes cobble stones bearable.
Parts needed:
1. Brompton telescopic seat post
2. Zoom 27.2mm size suspension seat post
3. Shaving drill bit
Instructions:
1. Shave the bottom half of the inside of the Telescopic insert using the shaving drill bit. You can even cut off a half inch of the bottom portion of the telescopic insert before shaving. NOTE: try not to over shave. That way you have a perfect fit and can lock the seat posts together snuggly
2. Assemble the Brompton seat post
3. Insert zoom suspension post into the bottom half of the Brompton seat post and attach desired seat
Enjoy the comfortable ride!
by JoshuaRuth