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@Smallfurry
81 x 0.883 = saddle height = 71.5
71.5 - 56 = height of seatpost + seat = 15.5
So if your seat is 5cm high you would have 10.5cm of post showing, which is about a fist full as they say. So maths says yes.
The real deciding factor is top tube length. Maths cant really help you there though.