Originally Posted by
Palomar01
The Roubaix also had a much more efficient frame to transmit the power I was using to forward motion.
You're talking about energy loss to frame flex; this is now exploded as a myth, thanks to use of strain gauge power meters. Losses of pedaling to frame flex either don't exist or are trivially small. Bike company marketing keeps the myth going, but it's very careful to avoid claims definite enough to be testable.
It has a AL triangle frame but uses CF for the forks and rear seat stays. This gives the bike a great ride without the cost of going full CF.
The Fuji does have a reputation for a good ride. However the presence of CF in the stays almost certainly isn't the reason*, although it does sex the bike up for marketing purposes. And you do know that a frame with any CF at all in it should be professionally inspected after even a minor crash and might have to be junked as a result?
I think the Fuji probably is a good buy - but that's not because of anything to with frame flex or those carbon stays.
*Carbon is supposed to kill road buzz because it resonates poorly. However loaded structures don't resonate - they don't have the freedom to move. And seat stays are definitely loaded, with the weight on the saddle. Carbon main tubes otoh do make sense.