A few months back I replaced my tires for shiny new BF Goodrich Radial T/As (love me some raised white letters).
As they do not offer stock sizes for the fronts I went a little bigger with 215-60r14 and 245-60r15 in the rear to balance the look.
Now with that said, I understand that tire pressure would/should not be the same as stock as different sized tires require different inflation based on vehicle weight and some other math.

Anyone have any advice on calculating this? The few articles I've seen online have left me confused.

Cheers
Steve