Originally Posted by Bianchigirll

Most all frames are subject to flex of some degree. I think rider weight and style has more to do with flex than just frame material and of course size. A slender smooth spinning rider may find a 56cm 980 980 tubed frame to be stiff enough for them where a rider the same height but say 3-40 pounds heavier with a tendency to push a bigger gear and struggles to climb may find the same 56cm 980 tubed frame to be flexxy.