For all the recent questions I once again would like to point out this reference guide.

http://www.tiresafety.com/images/Tire%20Replacement%20Manual.pdf

While is now 11 years old, this is probably the best tire reference manual with the most important information in one place, in a format that is easy to understand.
Of most benefit is the load-inflation tables for most every size tire we would consider. There is some good reading in here. I will be referenicing this manual occasionally in some of my responses to posted questions.

Dennis