Quest. Re. Tires...Yes, I know...another one!

I've used Goodyear G670 19.5 since day one. Original and 2 replacment sets of 6.
My chassis is an 20,700 pound F-53 20,700 pound version.
Up until about 4 years ago, during my NJ State inspection, I was able to get a print-out of how much my motorhome weighed...each tire, each axle and the whole thing.
Reading posts here on the Forum, I was wondering about the different psi on different tires (for weight changes) and called Goodyear. (Note: I've always run 80psi in all 6). Giving all the weights mentioned to the person at Goodyear, I was told I can run LESS than 80psi...but if I was happy, keep using 80psi on all 6. No need to run different psi on different tires.
Sure makes it simple...only one number to remember: 80.

Ray,IN wrote:
The Rubber Manufacturers Association (RMA) has information that conflicts with tire mfgrs. load/inflation charts. This RMA pdf, ch 4 is for RV's, page 55 states "However, never use inflation pressure lower than specified by the vehicle tire placard, certification label or owner’s manual. Nor should inflation pressure exceed the maximum pressure molded on the tire sidewall."

First, the RMA IS the tire manufacturers, so there can not be a conflict. If there is a conflict, it is an inadvertent one.

Second, the load tables are MINIMUMS (or maximums depending on which way you are coming at them). They are NOT recommendations.

So I don't think there is a conflict.

PastorCharlie wrote:

Tireman9 wrote:

goufgators wrote:
My tires are Goodyear 245/70R/19.5. After weighing, I'll be running 90 psi in each tire. I see on the Goodyear Load/Inflation Chart that there are some weights that are in bold print with a letter following: For example: 4080(F). I assume the "F" is a 'load rating' ??. My tires, however, are "H' rated which is not even shown on the chart. Are these letter ratings indications of the tires number of plys? Also, do I ignore the fact that my "H" rated tires are not even shown on the chart and still go with the 90 psi indicted by actual weight? Thanks, Larry

comments and advice deleted by author. good luck and safe travels.

At what ambient temperature should that adjustment be set if one drives from -30F to 90F?

comments and advice deleted by author. good luck and safe travels.

Tireman9 wrote:

goufgators wrote:
My tires are Goodyear 245/70R/19.5. After weighing, I'll be running 90 psi in each tire. I see on the Goodyear Load/Inflation Chart that there are some weights that are in bold print with a letter following: For example: 4080(F). I assume the "F" is a 'load rating' ??. My tires, however, are "H' rated which is not even shown on the chart. Are these letter ratings indications of the tires number of plys? Also, do I ignore the fact that my "H" rated tires are not even shown on the chart and still go with the 90 psi indicted by actual weight? Thanks, Larry

They show bold to help you see the max for that Load Range. The Letters E, F, G are the "Load Range" not load rating. "Load Range" replaced Ply rating many years ago.

What design are your Goodyear tires? G670 RV ?
It appears that Goodyear has not updated their web pages as I do not find a LR-H listed.

You didn't say what your measured load was for the heaviest end of each axle. If the heaviest loaded tire is 4190# single or 3970 in dual than 90 would be the minimum cold inflation.

I suggest you run an extra 10% ( 9 psi) so you don't have to adjust inflation based on changes in ambient temperature.

At what ambient temperature should that adjustment be set if one drives from -30F to 90F?

Ray,IN wrote:
The Rubber Manufacturers Association (RMA) has information that conflicts with tire mfgrs. load/inflation charts. This RMA pdf, ch 4 is for RV's, page 55 states "However, never use inflation pressure lower than specified by the vehicle tire placard, certification label or owner’s manual. Nor should inflation pressure exceed the maximum pressure molded on the tire sidewall."

comments and advice deleted by author. good luck and safe travels.

goufgators wrote:
My tires are Goodyear 245/70R/19.5. After weighing, I'll be running 90 psi in each tire. I see on the Goodyear Load/Inflation Chart that there are some weights that are in bold print with a letter following: For example: 4080(F). I assume the "F" is a 'load rating' ??. My tires, however, are "H' rated which is not even shown on the chart. Are these letter ratings indications of the tires number of plys? Also, do I ignore the fact that my "H" rated tires are not even shown on the chart and still go with the 90 psi indicted by actual weight? Thanks, Larry

comments and advice deleted by author. good luck and safe travels.

The Rubber Manufacturers Association (RMA) has information that conflicts with tire mfgrs. load/inflation charts. This RMA pdf, ch 4 is for RV's, page 55 states "However, never use inflation pressure lower than specified by the vehicle tire placard, certification label or owner’s manual. Nor should inflation pressure exceed the maximum pressure molded on the tire sidewall."

............................85......................100..............................120
245/70R19.5 D 3550 3710 3880 4040 4200 4360 4520 4675(H)
......................S 3750 3920 4100 4270 4440 4610 4770 4940(H)

rgatijnet1 wrote:
Remember, to carry the same load, the inflation pressure is the same no matter what the load rating is.

That is until you reach max inflation for a given ply rating. Load range H tires will carry more than load range F because they hold more air pressure.

Remember, to carry the same load, the inflation pressure is the same no matter what the load rating is.