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A 52 TT for a 177 seems awfully small, despite, I am sure, the result of a pro fit, though as pointed out, height isn't the real issue, it is inseam and arm length. I am 178cm, and all my bikes are "large" with between 55 to 57 TT, depending on frame geometry.I am 177cm. I ride a 52 Evo.
At 170cm, that is 7cm shorter than me. That would be a 48-50cm frame (depending on the brand).