Same here. In my experience, Continentals run small (e.g. 25-26mm on a 700Cx28 callout) and Specialized run large (e.g. almost 30mm on the same callout size). I can put Conti 700Cx28 on the Bianchi, but not Specialized.
Even more frustrating is bead diameter vs. rim diameter. There is no way I can get a 700Cx28 Michelin folder on a Campag. Omega rim. Contis are a tight fit, but they do work.
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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