I have a 56cm '00 Trek 1000 and a 57cm '05 Bianchi Giro. They fit about the same. Just a hair more clearance on the Bianchi because of the sloping top tube. Don't know if that helps.
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"The older you do get, the more rules they're gonna try to get you to follow. You just gotta keep livin', man, L-I-V-I-N." - Wooderson
'14 carbon Synapse - '12 CAAD 10 5 - '99 Gary Fisher Big Sur