I’ve had a couple questions sent to me about whether the Domane actually has a pivot point in the seatpost, or whether it just has an elastomer to isolate the seatpost from the seat stays and top tube.
It has a pivot point.
Pic from cxwrench on RBR.
There are 2 bearings; both are 19mm outside diameter, 10mm inside diameter, 5mm wide. Both are sealed. The seatpost flexes on a pin through those bearings (the bearings being located in the top tube/seatstay junction). There is also elastomer in the joint to help control flex and keep vibration down.
And yes…when you push down forcefully on the saddle, the top of the seat tube flexes back, and the ‘middle’ of the seat tube (between the bb and top tube) flexes forward. If you watch that bottle cage, you can see it move forward in response to the flex.
That’s all. Carry on.