Hello C&V. I usually hang out on the mechanics forum but had a question about old leather saddles I thought more geared to the C&V forum.

On my bikes with standard modern saddles (some sort of padding over plastic shell), saddles are generally comfortable for me when they are almost exactly parallel to the ground or maybe with a very slight nose down tilt.

Well, I have a well worn but still in descent shape leather saddle (Japanese knockoff of a Brooks) that, if I set it up parralel to the ground, it feels like when I am riding that nose is pointing down significantly -- like riding down hill or I am about to slide off the front. To be comfortable, the nose has to be tilted upward to a visually noticable degree. So it looks tilted upward but feels parralel. For life of me, I can't figure out why this leather saddle would ride so differently than my other saddles . Is there something about a saddle that is essensially a sheet of leather attached to railes, with no other supporting structure that would explain this. Or is this perhaps a symptom of sagging leather?