| Thanks for the comments so far,Im not sure what the spring rate is,had to wind on a fair amount of preload to get 10mm static sag. Im 71kg sat upright on bike when mesurements taken.Im confused as to calculating loaded sag,is it the difference between the static sag and rider or unloaded +static+rider,in my case:-
Static measurement433mm,+rider =400mm Loaded sag 33mm.or
Unloaded443mm,static433mm+rider=400mm Loaded sag 43mm.
Most of the web set up guides suggest 30-40mm loaded sag,am I that far out? | 
Threaded Mode