It appears the Ultegra and up version get flat mount/thru-axle, but 105 version stays post-mount/quick release.
See: https://www.evanscycles.com/cannondale-caad12-disc-ultegra-2018-road-bike-EV308150 https://www.evanscycles.com/cannondale-caad12-disc-105-2018-road-bike-EV308152
That's a bit shady really. I wonder if they've improved tyre clearance on those frames.
@jv started
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It appears the Ultegra and up version get flat mount/thru-axle, but 105 version stays post-mount/quick release.
See:
https://www.evanscycles.com/cannondale-caad12-disc-ultegra-2018-road-bike-EV308150
https://www.evanscycles.com/cannondale-caad12-disc-105-2018-road-bike-EV308152