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@miller
not entirely sure what you mean by "seat crank"? But from the middle of the crank, at the bottom bracket, to the top of the seatpost, where the saddle rails are, is 73cm. then from the middle of the crank to the top of the saddle is 78cm.
Its full carbon, inside the slit at the back of the seatpost you can see layers of carbon constituting the tubing. I dont know whether this is the accurate way to check, but also the tubes dont feel like metal at all.
hope this answers your question