Component and frame failures are a true danger, but with some modern equipment as well as old, heavily used parts. Having broken three cranks, two frames, three rear axles, a platform pedal, a front hub flange, and various spokes, I am always vigilant regarding potential early signs of impending failure. Unfortunately, a lot of stuff snaps without warning.
I did retire the original, high-mileage Ofmega CX cranks on the Bianchi in favor of newer, lightly-used Bianchi-labeled Ofmegas, and the Peugeot UO-8 has a late 1990s Salsa stem instead of anything period-correct. Overall, I tend to favor sturdy and reasonably lightweight over lightest-available components.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069