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Old 06-14-2017, 01:16 PM   #1
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Location: Akron, Ohio
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Tire inflation questions

Some general comments and requests to those posing questions about tires and specifically about how to set the inflation.

As reported in more than one thread on the topic of inflation, the answers and information can be confusing to many.
The specific numbers for one RV are seldom correct for another RV even of the same make, model and year, as the amount of "stuff" one person carries is never identical to the stuff someone else carries.

It will also help if when you post your initial question you provide the following facts. This will save everyone time and confusion.

FACTS that are needed include:
1. Full tire size including load range and tire company
2. GAWR for Front, Rear and Tag if so equipped. Also GVWR. This is on your "Certification label"
3. RV Co recommended tire inflation for each axle. Also on the Cert. Label
4. Actual "4 corner" weights for each end of each axle when the RV is at its heaviest. If you don't have "4 corner weights" then individual scale weights for each axle. (If you have a TAG it would be "6 corner scale weights")

When we do not know the above information, we end up having to ask for the missing information which can add to the confusion with questions and quote answers sometimes generating more questions which makes it harder for those of us offering answers to keep the information of who said what and what question is being answered clear.

NOTE. If you discover that any of your scale weights exceed the max load rating of an axle or the vehicle you must do something to bring the coach in compliance at once. Doing calculations and setting pressures will simply need to be redone after you lower the RV weight.

Your assistance will be greatly appreciated.
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.Write a blog on RV tire application RV Tire Safety. 40 years experience as tire design engineer. Freelander 23QB on Chevy chassis is my RV. Giving seminars on RV Tire applications (not selling)@ FMCA in Tuscon, AZ in March 2020
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Old 07-16-2018, 07:46 PM   #2
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Location: Bandera, Texas
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Tireman9,

Thanks for the detailed comments on how we should ask for assistance in determining the proper tire pressure on our motor homes. I have a 2017 Georgetown 30X3 and I've been setting all six tires at 100psi based on the dealership's recommendation.

On a recent 2500mile trip I noticed how rough the ride was so I started researching tire pressure issues; came across your post.

Here are the details on my current MH:

Tire Size: 245/70R19.5, Load Range G
Manufacturer: Goodyear G670RV
GAWR Front (S): 7000
GAWR Rear (D): 12000
Recommended Tire Inflation: 82psi

I don't have the "actual" axle weights yet, but will do that very soon.

Since I've been setting the tire pressure at 100psi for over 18 months, is there any issues with reducing it to 82psi. Once I get the axle weights I will adjust to what Goodyear states.

BTW, the Goodyear load/inflation information for my tires states:
Single Load Limit of 3640 at 80psi or 3740 at 85psi
Dual Load Limit of 3415 at 80psi or 3515 at 85psi

Thanks for any insights and recommendations that you could give me.
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Kelly & Sara Sandifer
Bandera, Texas
2017 Georgetown GT3 30X3
Harley Davidson Trike & Hobie Mirage Outback Kayaks
7x14 Covered Trailer (for Harley and Kayaks)
2016 Jeep Wranger (Toad when not on HD or Kayaking)
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Old 07-16-2018, 08:06 PM   #3
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Quote:
Originally Posted by kjsandifer View Post
Tireman9,

Thanks for the detailed comments on how we should ask for assistance in determining the proper tire pressure on our motor homes. I have a 2017 Georgetown 30X3 and I've been setting all six tires at 100psi based on the dealership's recommendation.

On a recent 2500mile trip I noticed how rough the ride was so I started researching tire pressure issues; came across your post.

Here are the details on my current MH:

Tire Size: 245/70R19.5, Load Range G
Manufacturer: Goodyear G670RV
GAWR Front (S): 7000
GAWR Rear (D): 12000
Recommended Tire Inflation: 82psi

I don't have the "actual" axle weights yet, but will do that very soon.

Since I've been setting the tire pressure at 100psi for over 18 months, is there any issues with reducing it to 82psi. Once I get the axle weights I will adjust to what Goodyear states.

BTW, the Goodyear load/inflation information for my tires states:
Single Load Limit of 3640 at 80psi or 3740 at 85psi
Dual Load Limit of 3415 at 80psi or 3515 at 85psi

Thanks for any insights and recommendations that you could give me.



Sounds good. Minor comment


1. Next trip when you are full of water & fuel and "stuff" stop at a truck stock scale and learn the actual axle loads.


2. Assume one end of the axle has 53% of the axle load and use that number for the Goodyear table to learn the MINIMUM inflation


3. add 10% to in "minimum" inflation and use that for your "set" pressure


4. Get and use a TPMS


5. Read and subscribe to my blog to get and stay informed.


6
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.Write a blog on RV tire application RV Tire Safety. 40 years experience as tire design engineer. Freelander 23QB on Chevy chassis is my RV. Giving seminars on RV Tire applications (not selling)@ FMCA in Tuscon, AZ in March 2020
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