I don't know how this is happening. My bike fits me fairly well, although it is a little short in the cockpit. I lowered the stem a quarter inch and moved the seat back a centimeter or so. My saddle fits and I feel my sit bones sitting properly on the saddle, and most of the time, I don't feel at all uncomfortable. It's like I could go for days.

But, come time to get off the bike, and I walk around a bit, and I go to get back on the bike or sit on the floor to stretch and I feel like someone pounded a roofing nail up my tailbone.

I try flattening my back and not hunching my shoulders, and that gets me sitting on the sit bones right, but why would I have tailbone pain? Unless my sit bones are pushing straight up to my tailbone because of my position.

Has anyone else had this? I've had this issue since I started, and it did not change when I switched out saddles (twice now.)