Nokian mount and ground W 2" wide 26" can be run pretty soft because of their substantial sidewall.
not far off the above pattern but the tungsten steel studs
will not wear down. For my occasional use, still OK 20 seasons on.

But to prevent torque creep, Alaska based Allweather Sports suggested tubasti,
aka sew up tire glue, and glue 1 bead to the rim, so the tire wont slip, and take the tube with it
and shear the stem out of the tube,

Then 30~40 psi is OK.. but NB: Im on 26" wheels, not 700c...

reading linked page, PW says 45psi for the 26" & 200# rider.

my SnowCat rims are 45mm wide, tire is 50mm wide, so tire cross section is more D shaped
than the rounder profile of my fair weather wheels.

the D shape at low pressure puts more contact surface footprint down,
as well..