I absolutely love my Brompton, but I've always had difficulty with the saddle. After just about every ride, my backside hurts, and lately it is even worse. I use padded shorts, I've adjusted the tilt on the seat various times, but to no avail. I do notice that if I sit way back on the seat, I get some relief. Height wise is fine, as on the complete down stroke I maintain a slight bend to the knee the way it should. There is a forward and rear adjustment on the saddle, does that have any bearing? Also, I'm wondering if sitting more upright, which I do, can contribute to the problem. I haven't made any adjustments for and aft, but other than that, would a saddle change be in order? Perhaps there are more comfortable ones other than the saddle that came with the bike? Thanks for your help. Edit: I adjusted my seat back as far as it would go. Probably about 3/4" travel that had remained. Went for my ride this morning and within a couple hundred feet, I could feel my butt starting to hurt. I got off the bike and thought perhaps if I lowered the saddle some. So I lowered it about an inch, climbed back on and low and behold it felt much better. Not perfect, but better. Enough to at least enjoy my ride more. I'm actually amazed that some minor adjustments can make a big difference. Either this a day this week or next, I'm heading over to a local bike shop to have my sit-bone measured and perhaps, if necessary purchase a better more appropriate seat. After all, what's the point of riding if you are going to be in pain. At least the pain this morning wasn't near as bad.