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@user120099
By my best estimation, Cannondale used:
Seat tube: 27.2mm ID/31.8mm OD
Top tube: 34.9 OD
Downtube: 50mm OD
Head tube would be same as seat tube to accommodate 1” fork steerer.
The downtube dimension is an estimate. I know it’s greater than 4.5cm (45mm) dia.