Aftermarket Tire Air Pressures - Ram Promaster Forum
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post #1 of 5 Old 04-25-2019, 05:52 PM Thread Starter
ctex
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Aftermarket Tire Air Pressures

Hey Guys,

I just installed 17" wheels and got General Grabber tires for my Promaster 159". The max PSI for this tire is only 44psi, where the stock Promaster Tires have a PSI of 80psi.

Stock Max Load is 2470 for single and 2680 for dual
With these new tires the max load is 2469.

Will I be ok running these new tires?

-Cory Texter
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post #2 of 5 Old 04-25-2019, 06:37 PM
MtBiker
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If the load range is correct than the manufacturers max PSI should be good. Do not run more than the manufacturers pressure rating when the tires are cold.
Your pressure sensors are not going to work at that range. You may want to see if you can get the dealer to adjust range on the computer.
You may get a bit of rear tire squirm when loaded and at freeway + speeds.

Nice run in Texas

2017, High Top/159 WB, 2500 gas Promaster
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post #3 of 5 Old 04-25-2019, 08:23 PM Thread Starter
ctex
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That's what I thought and was hoping. Appreciate it. And thank you. It was a good weekend!

-Cory Texter
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post #4 of 5 Old 04-25-2019, 08:51 PM
pjoconnor2001
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A dealer has the ability reprogram the sensor activation to any PSI you desire, if they are willing. Many (mine incl) will not fearing potential liability. Many with the bone jarring Vancos run reduced pressures. This does reduce the max load recommended by the manufacturer. I believe when I looked it up when deciding to run 55 psi myself, it reduced the max load from 3195 to 2270 lbs each (So, 464 lbs. under the max rear axle rating of my 118 van, not a problem for me in typical usage).

One note, if you are using a tire not designated at least “LT” the tire manufacturers advise to de-rate the published max load rating by 9%.

2017 118" WB, Gas, Deep Cherry Red Crystal Pearl (Dark Red if you're not in marketing).

Last edited by pjoconnor2001; 04-25-2019 at 08:54 PM.
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post #5 of 5 Old 04-29-2019, 03:41 PM
Wankel7
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What exact tire did you get? Size and load index?
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