Originally Posted by
feijai
I first had a large, then it was replaced with a medium, and I found the medium to be significantly more flexy. That resulted in a lot less bounce. Note that mine is also an odd length: I wanted it low enough that I could add a Thudbuster in the future. The other major difference can't be replaced so easily: specifically the lower (black) seatmast portion (0.065" vs 0.05").
Wait a second.
There's excessive flex in the stem? Now you have to add a Thudbuster because the bike's too uncomfortable? LOL!
I guess that's why people like me are are keeping our Bromptons. In fact, I can't remember when if I ever saw a Brompton with a Thudbuser. It doesn't need one because it's one of the most comfortable 16' inch wheel folders on the market. Probably on the Birdy and Maulton offer better suspension but at a premium. I haven't had to make on change on my Brompton. It's perfect.