If you need a 49, Specialized offers their Tarmac & Roubaix in a 49 both are carbon. Or the Allez which is aluminum, however, has carbon seat stays, fork, etc as does the Trek. The Allez also comes in a 49.

Specialized also does indepth testing on their carbon bikes and lists such info in their catalog.

Just thought I would offer another option.

~ JoAnn