Originally Posted by
CliffordK
Aluminum frame, carbon post.
I also wonder about perhaps a marginally compressible Carbon post being over-tightened.
On the bright side, someone posted a photo of this Tandem a while ago.
Reynolds 531 Gitane Tandem
Steel, of course, but it looks like half the mast was cut off, either by an owner, or at the factory, and it is still stable.
if the post mast was to break (it would take a very long crack), it would result in a twisty post, rather than a sudden loss of the seat.
I've had a short seat post hop up high enough that when you were slammed down at the other end of the bump it levered the post over and broke it off. The riding home standing was not all that pleasant. Now I never use short posts like Colnago used to make