Almost forgot,, I did a test ride on a Giant folder with narrower tires,, I think they were 20 X 1.25's I felt every single sidewalk crack.
I did not buy that bike because of the ride.

The 1.25 wide tires both had 60 psi,, With my 1.75 wides I run 50-55 in my front and 55-60 in the back. I am 173 pounds.