Originally Posted by LWaB
The top of a Brompton telescopic seatpost is not 27.2 diameter. I can't recall off the top of my head but it is 26.something
FYI - I went straight to Calhoun Cycle and this is what I learned:
"The Evo XL Seatpost for Brommie's uses a standard 27.2mm seatpost as the top post (the one that the seat attaches to), so yes, you would possibly be able to find a custom post for your application that might work even better than stock unit.
The Clamped version is definitely set back when compared to the stock Brommie set up (just as you were thinking), so likely you wouldn't need to chase out a different seatpost, but the option would be there. The seat stub that Brompton uses to move the seat back would be similar to using the Evo unit with a clamped saddle and then adjusting the saddle back (away from the handlebars)."
I am going to get one. Sounds like just what I need.