My 1971 Nishiki competition's full double-butted Ishiwata CrMo frame had an inordinate amount of bottom bracket flex, but it got me through a three hilly centuries and a 12:18 double century and 40k cumulative road miles (65k km) before the seat tube lug finally broke away from the rest of the BB shell. In general, early 1970s Japanese CrMo frames tended to feel mushy, but the situation improved steadily during that decade.

Unremarkably, my Bianchi has far less BB flex than my Capo, reflecting a 20-year difference in design philosophies for long distance road racing machines, which had alot to do with the gradual replacement or covering of cobblestones by much smoother asphalt in Europe. On a sprint or a hill climb, I'll take the Bianchi, but on a century, I'll settle for the comfort of the Capo.