Originally Posted by
Northwestrider
What type of seat is it ? If it's a Selle Anatomica , they have a history of that problem. Mine squeaks, it's the bolt at the front that is the problem in that case. They used to talk about the problem on their web page. I have no idea if it is still listed there.
I had that issue with a Selle Anatomica when I transferred it to a new bike. A bit of overdue tension adjustment and a few miles and the issue went away.