Jan queried:
I wonder whether anybody really has a good handle on what the loads are on a tandem while both rides are pedaling hard?
Santana is in final stages of making available a dynamic load instrument available that will objectively measure tandem frame stiffness. I don't know the specific details of the measuring process; however, I have always found Bill McReady at Santana a friendly good source of information.
Chris Gonzalez
Carmel, CA