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@Smallfurry
I was under the impression that inseam, when referring to bike fitting, was from groin to ground, while wearing your bike shoes.
Going by your inseam, I'd hazzard a guess at 55 (C-T).
The best way to judge without paying for a fitting, would be to borrow a bike from someone who has a 55/56 and compare it to what you have.
The most important measurement is the top tube length, which is very difficult to calculate. It is just as dependant on riding style and flexibility, as it is on height.