what size seatpost

have rechecked and it seems to ne either 30.6 or 30.8.........used wrong seat post first time...i used my 30.4 to check thinking it was my 31.6
 
i tried to measure with a steel ruler today but my tired eyeballs cant see that well down to a tenth of a millimeter....guess i need to get a seatpost or two and stuff them in to see whats what...
 
its looking tat way but i hate being beaten by bikes...plus its 90 percent built...just waiting on two bolts ,some washers and the dreaded seatpost...i have to say once again its a lovely frame ...builds up very light,i just hate the new deore rear mech on there...i wish i had something a bit older like a silver campy mech instead....
 
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