On my Caad12 disc I ran 140mm front rotor with post mount, no adaptor.
Weird, I've put 160 on the front of mine, no adapter
What year is yours? Fork design might have changed. Mine was 2016.
Cannondale specify 140mm only on synapse front & rear. 160mm invalidates warranty. Maybe to do with clearance as always wondered
@PhilDAS started
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On my Caad12 disc I ran 140mm front rotor with post mount, no adaptor.