Chris,
If you are refering to this tech tip, you are right that there are different tire size recommendations.
http://www.stovebolt.com/techtips/wheels/Do you know what the "s" or "t" suffixes mean?
Hopefully Grigg will be able to shed some light on this as he the author of the tip.
I also recall wheel width measurement conventions changed sometime in the late 40's-early 50's. Details are hazy.
Paul
