To make things easy:
Rider & Bike weight: 200lbs.
Tire tread width: 1 inch
If the rider has position of exactly 50% on each tire then:
Rider & Bike Weight = real world pressure
Tire width x 2
200= 100lbs/tire
1x2
If I had a 1.25” (1 ¼”)
200= 80lbs/tire
2.5
This is to get the rated tread pattern for the tire to have full contact with
the road.
There is not a reason to beat yourself up from road shock.
Have a tire that allows you the performance that you want.
Now, in the real world the rider can be positioned with weight distribution of 40% front and 60% rear.
Take the calculated tire pressure and multiply by the coefficient.
100 (lbs) X .8 = 80 lbs for the front tire
100 X 1.2 = 120lbs. if the tire is rated for this type of pressure.
If not then either purchase one that can or go to a tire that is 20% larger
for the back.
Happy riding!