Originally Posted by
Paul Barnard
I would guess it is where your seat post connects with the seat rails. Take it apart, wipe a very light layer of a light lube on the contact points and reassemble.
Secondary to that the stem/bars contact.
If you have a quick connect chainlink, inspect that.
The top two have accounted for the majority of my click/creak issues.
I wouldn't think it would be the seat rails. It only clicks when the crank is in one position