56 CAAD = "58" Master X Light
I have both. 5'11" here.
The 58 (Colnago Sized) master X light I've owned - well, forever - fits me like a 56 "square" (even thought the effective TT is something like 56.3)...within spitting distance of my 56 CAAD (which is truly a 56 TT).
m_b
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