Originally Posted by PlayItForwrd
Taking that experience into account, then it would seem prudent that you'd need MORE air in a G rated RV tire for the same weight as an F rated tire. However, the 44 psi car tires had a SOFTER sidewall than the 35 psi tires, which is the opposite -typically- to RV tires--
or is it? Suppose it depends on the who's making the tire... The old Michelins removed from our Allegro have the such flimsy sidewalls I'm surprised they'll hold up a motorhome at all. The Samson's and Sumitomo's that replaced them have MUCH stiffer sidewalls...
No questions, no answers either...
Logic would support that theory, but a quick look at the Goodyear inflation chart shows that for a given weight the F and G use exactly the same pressure, just that the G has a higher max psi.
Another thing that confuses me is the "ply rating" vs. how the tire is actually constructed. Read an article about light truck tires that said regardless of ply rating, most LT tires are 3 ply sidewall! I suppose the fabric is thicker or better weave in the higher ply ratings?
It's all very confusing.