Max Tire Pressure vs Load - Ram Promaster Forum
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post #1 of 8 Old 04-25-2019, 05:56 PM Thread Starter
ctex
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Max Tire Pressure vs Load

Hey guys,

I got some General Grabber tires for my new 17" wheels. The max air pressure for them is 44psi. The stock tires have a max air pressure of 80psi. If you have the tires under 65psi, the light comes on that you need to put air in the tires. The max load for the stock tires is 2470 (single) and 2680 (dual). The new tires I have has a max load of 2469, but way less air pressure is required. I am going to be driving this van all over the country and just want to make sure I will be OK with what I have. Thanks for any help!

-CT

-Cory Texter
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post #2 of 8 Old 04-25-2019, 08:29 PM
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Get your van weighted at a Cat Scale so you can verify the front and rear axle weights.
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post #3 of 8 Old 04-25-2019, 08:59 PM
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Quote:
Originally Posted by ctex View Post
......cut..... The max load for the stock tires is 2470 (single) and 2680 (dual). The new tires I have has a max load of 2469, but way less air pressure is required. .....cut.....
Your single versus dual load ratings are likely backwards. Single load ratings per tire are higher than when used as duallies.
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post #4 of 8 Old 04-25-2019, 09:53 PM
phil
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Quote:
Originally Posted by ctex View Post
Hey guys,

I got some General Grabber tires for my new 17" wheels...cut...

-CT
Out of curiosity what is the tire's entire name and the size?
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post #5 of 8 Old 04-29-2019, 03:04 PM
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You can go to the ram dealer and they can do the computer thing to tell which tires are rated for your promaster.....you can then go to Amazon and buy them about 1/2 price......i talked deal and got better price @ dealer but not better than amazon....but got free rotating for life of tire with mileage warrenty and price break on tire alignment....if you buy from Amazon someone has to put them on
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post #6 of 8 Old 04-29-2019, 03:20 PM
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yeah but its a little more complicated since dealer is going to tell you which tires are rated for max load of your promaster. many of us with campervans are never going to come close to max load in our PMs. what we really need to know is what tires are rated for our loads (current and anticipated) and at what tire pressure.
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post #7 of 8 Old 04-29-2019, 04:58 PM
GaryBIS
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Hi,


You might find this old post helpful:
https://www.promasterforum.com/forum...ad.php?t=47137


I was going through somewhat the same thing trying to figure out how low I could safely go on tire pressure given that my actual axle weights are much lower than what the van is designed for.


Unfortunately, the inflation pressure vs allowable tire load link I gave is not working anymore, but you should be able to find the data online. You need the equivalent chart for your tire. If you can't find it online, the manufacturer should be able to provide it.



My dealer lowered the threshold pressure for my TPMS so that it does not come on even with the lower tire pressures I run -- they did not even charge for this!


Gary

136 WB PM, high roof, 1500, gasser, 2014.
SW Montana
www.BuildAGreenRV.com
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post #8 of 8 Old 04-29-2019, 04:59 PM
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What about the uconnect problem----- I mean opportunity
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