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Old 11-14-2018, 08:21 AM   #1
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Tire pressure vs. load?

So I posted earlier about rough roads tearing my RV apart. Someone replied that I should reduce the PSI of the tires to match the load in order to soften the ride. So I am trying to research that idea. I found the chart below for Michelin but having some trouble understanding it. Assuming I have my RV weighed and know the weights on each axle, can I set the pressure to match the weight based on a chart like this for the tires I have? Do you do this or do you just run it to the max PSI listed, which is what I do. 75 psi up front, 80 psi in the rear.


Michelin Load & Inflation Chart
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Old 11-14-2018, 08:51 AM   #2
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I am a big fan of using the load inflation charts instead of max.

Unless you find and pay for individual wheel weights you will get one number for all the trailer axles. Take this number divided by the number of tires. Since all the tires will never have the same weight add about 25% to this number and set the inflation based on this number.

Be sure and do the weights with the camper ready to go and if you get individual weights use the highest and don't add the 25%.

Edit: Missed the motor home part so yes be sure to do the axles separately, grain type scales generally do the entire vehicle at once, truck stops / CAT scales will have 3 separate platforms. Still apply the 25%
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Old 11-14-2018, 10:12 PM   #3
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Yes, there's no reason to use max psi if the axle is not maxed out. Remember, however, to use the same psi (from the load table) on both tires on the same axle. In other words, if you have 2,500lbs on the left tire and 3,000lbs on the right tire on a 7000lb axle, both tires are aired for 3,000lbs.
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Old 11-14-2018, 10:40 PM   #4
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Look into putting shocks on the trailer ??????


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Old 11-15-2018, 08:29 AM   #5
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Quote:
Originally Posted by Oaklevel View Post
Look into putting shocks on the trailer ??????


SQUIRREL!!!!!!!!! what does putting shocks on a trialer have to do with the tire pressure/load on a rv?

thx.

I just keep them at the 75/80 pressure. I wouldnt want premature tire wear from underinflation.

Bob
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Old 11-15-2018, 10:22 AM   #6
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65-70 psi here on my 2251 (about 11k loaded).
I never go to max with my small rig.
No unusual tire wear. I will replace them anyway in 5-6 years long before the tread wears out.
Mine rides pretty good...especially with the motorcycle on the rear.
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Old 11-15-2018, 10:40 AM   #7
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I had the same issue when I went from stock tires to Goodyear Endurance. I had them put on and had max PSI 85PSI in the tires. Stuff started to come apart within the camper. After advice from people on this group I reduced the PSI per the Goodyear tables for my weight and now run 65PSI. All is well now.

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Old 11-15-2018, 01:51 PM   #8
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I just keep them at the 75/80 pressure. I wouldnt want premature tire wear from underinflation.
X2...I have never been concerned about load and not have had any issues with 33,000 miles at those PSI having had 2 sets of Michelin since day one.
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Old 11-15-2018, 01:57 PM   #9
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How so you like the Endurance tires. Does the 2703WS sway less. Did you replace valve stems with something else?
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Old 11-15-2018, 02:44 PM   #10
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I believe that your Michelin chart is the wrong one. You need the tire pressure vs load chart found here:

https://www.michelintruck.com/refere...tion-tables/#/

After you weigh your rig, then you can use the tables to determine the PSI of the tires. Note that there are different values for single tires vs dual tires. Also, at most places, you can get separate weights for the front vs rear axles.
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