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Old 06-15-2013, 07:07 AM   #15
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Originally Posted by PlayItForwrd View Post
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.
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Old 06-15-2013, 11:03 AM   #16
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Actually, no, you can NOt run G rated at a lower PSI...

Have you consulted Load/Pressure tables?

The tables I've consulted all give lower tire pressure recommendations for the same axle weights for G rated tires than F rated tires.

I did a fair amount of research on tires when I replaced those on my coach.

http://home.roadrunner.com/~kwildman...cing tires.doc
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Old 06-15-2013, 11:19 AM   #17
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I just replaced the tires on my new-to-me motorhome on Monday. I went with Michelin tires because of the FMCA discount. They recommended the 245/70R 19.5 XZE 16P Load range H for my 35 ft. class A with 2 slides. I had my MH only one month when I had a tire blow out, so I was very cautious about the new tires.
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Old 06-16-2013, 08:48 AM   #18
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Originally Posted by UltraKen View Post
Have you consulted Load/Pressure tables?

The tables I've consulted all give lower tire pressure recommendations for the same axle weights for G rated tires than F rated tires.

I did a fair amount of research on tires when I replaced those on my coach.

http://home.roadrunner.com/~kwildman...cing tires.doc
Have the Goodyear pressure chart printed out in my motorhome and the F and G tires are same pressure for given weight just that the table changes from F to G when the pressure exceeds a certain point. Now possible that this varies by manufacturers.
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Old 06-17-2013, 05:03 AM   #19
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Have the Goodyear pressure chart printed out in my motorhome and the F and G tires are same pressure for given weight just that the table changes from F to G when the pressure exceeds a certain point. Now possible that this varies by manufacturers.

I checked the Toyo tables, since I installed new Toyos about 2 years ago. They no longer make an F tire in my tire model - so my info is out-of date. I do know that when current the information I gave was in accordance with their table.

I may have an image of that table on my computer. If I find it I'll post it.
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