My neighbor and I tried the Princeton Tec Switchback handlebar mount on his FSA bars later last night. I forget the bar model, but looking at the website it appears that their handlebars are all shaped the same. Anyway his are large and flat on top.

It looked like the mount would work with a longer bolt. He had a longer bolt but it was not the right thread type and did not have a know. The bolt seemed to line up properly so we concluded it would probably work. Anyone have any experience with this mount on these bars? What type of mount does he need for these bars?

In addition to the mount, I was not sure the battery could be mounted to any of his tubes. The derailleur cable runs directly underneath the top tube and the seat tube and down tubes are aero and narrow so there probably is not enough surface there to keep it stable.

My solution is to put a light on the helmet. I think he will like the light better helmet mounted, but bar a bar and helmet combination is ideal. How do you mount a battery to the frame of these newfangled carbon bikes?

Is there another light that will work better with the Cannondale Synapse FSA bar combination?

Just one more reason that I am glad I bought a steel Serotta with round tubes and have old-fashioned round bars. But that's another discussion.