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@gbj_tester
There are graphs and tables and rules of thumb. My formula is:
tyre pressure(psi) = ½[total rider + bike weight(lb)] x 23/tyre section(mm)
so for you at 185, say 210 total and 25c tyres
psi = 105 x 23/25 = 96psi
as a starting point, but you can then drop up to 10% in front and adjust both by a further ±10% according to personal preference, weather, terrain, tyre characteristics etc. Also, the best comfort, best handling and lowest rolling resistance are likely to occur at 3 different pressures, so you have to find a compromise which suits the ride you're on - for a typical 10 mile TT where comfort is irrelevant and handling is whether or not you have to get off the tribars for the turn, the compromise will be different than it is for a 6h day out in twisty country lanes.