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@apc
These are the measurements according to [here], but cant find any official documentation (https://www.airevelobearings.com/product/cannondale-supersix-headset-brg-pair/)
Upper Bearing – MH-P08 (30.15×41.8×6.5 – 45/45)
Lower Bearing – MH-P22 (34.1×46.9×7 – 45/45)