You should be able to fit 32s at a minimum
Edit: Based on fitting 32s in a CAAD 10 disc. There were posts earlier in the thread. I think @Dammit has 32s in his CAAD 12 too
Think it was 30mm, and I wouldn't really go bigger otherwise the tyres will rub on the frames.
@edscoble started
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You should be able to fit 32s at a minimum
Edit: Based on fitting 32s in a CAAD 10 disc. There were posts earlier in the thread. I think @Dammit has 32s in his CAAD 12 too