I suggest getting the stack and reach of the caad12 and checking that against Grizl. M isn't a caad size so which frame?
My mate was happy on a M at 180.
54 is my frame size for CAAD12
Given you run shorter stem on grizl. Looks like S would be close to the caad. This assumes fit on the cadd is good.
@Kreddy started
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I suggest getting the stack and reach of the caad12 and checking that against Grizl. M isn't a caad size so which frame?
My mate was happy on a M at 180.