At my age there is little danger of seriously flexing a BB, but I must be insensitive as I have two Tommasini super prestige from the early '80s a SL and SLX and a '81 Pinarello Montello from the Levi Team SLX and had until recently a Pinarello Montello SL early 80's. While not perfectly similar builds I perceived no difference in frames, least of all the 1 oz+ difference in weight. As a keeper test I do run all bikes down a serious decline near the house at much higher speeds than I am happy with and hit some mild undulation near the bottom before a relatively sharp turn.