Question about tire pressure

[Lon]

I have 20" wheels with 275/55/R20 tires. The tires have a max pressure listed of 50 psi. The doors recommend 37 psi. This morning (really cold morning) my tire pressure light came on.

What pressure do you all think i should run? I am thinking 40 psi but not sure if that is right. Only had my first Ram for a week now.

What does everyone think?

 

[RR7_905RAM]

Do what the door says not the tire!

I have mine set at 35.
40 will be OK but you may feel every bump in the road!

 

[Limeybastard]

I run 40 psi all round. Perhaps to be **** if carrying full load 42 rear 40 front.

The wheels don't seem to hold air for long after a month or two they are all rolled back by a few psi anyways.

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[adurm]

As I'm sure you know, air is denser at colder temps. If you put in 40 psi when cold, check them when it gets warm again. You may find that 40 psi turned into 42. Overinflated tires wear down the center while underinflated wear the edges. This is different than alignment issues causing feathering along the edges that you can feel if you run your hand along the edge in one direction or the other.

The TPM light might stay on for 3 engine on/off cylces even after you fill the low tire.

But yes, 40 should be fine at least for the winter. If you have the money, look into nitrogen instead of regular air (21% O2, 78% N, and trace other gases). The nitrogen doesn't migrate through the rubber and is less likely to change volume with temperature changes. Plus with regular air, you can get humidity in the tire if you get air from a poorly maintained compressor. Humidity will cause pressure changes and possible corrode the wheel.

 

[CMil527]

i usually run 38 myself!

 

[AustinB]

40... To me, anything below 35 feels "mushy" when turning.

 

[bigolayne]

Green caps and you don't have to really worry that much. You will stay at a constant with nitrogen.
But if not I would run what the door is saying and not the tires. Tired can be on any vehicle but your vehicle is on those tires so you go by the vehicle.

 

[WolfRam250]

As I'm sure you know, air is denser at colder temps. If you put in 40 psi when cold, check them when it gets warm again. You may find that 40 psi turned into 42. Overinflated tires wear down the center while underinflated wear the edges. This is different than alignment issues causing feathering along the edges that you can feel if you run your hand along the edge in one direction or the other.

The TPM light might stay on for 3 engine on/off cylces even after you fill the low tire.

But yes, 40 should be fine at least for the winter. If you have the money, look into nitrogen instead of regular air (21% O2, 78% N, and trace other gases). The nitrogen doesn't migrate through the rubber and is less likely to change volume with temperature changes. Plus with regular air, you can get humidity in the tire if you get air from a poorly maintained compressor. Humidity will cause pressure changes and possible corrode the wheel.

I agree 100 percent, The only thing left out is, more presssure better mileage, less pressure better ride. I'm from the OLD school, follow the tire recommended pressure as close as possible to reduce wear. Hint my 1st Truck was a 1968 dodge D 100. Does anybody remember those old straight axles? And bias ply tires?.

 

[Graygoose]

Green caps and you don't have to really worry that much. You will stay at a constant with nitrogen.
But if not I would run what the door is saying and not the tires. Tired can be on any vehicle but your vehicle is on those tires so you go by the vehicle.

I have nitro in my 2015, green caps, cool front came though, still was like 2-3 psi in each tire change Weird.

 

[MADDOG]

What is your cold tire pressure now?

 

[Graygoose]

What is your cold tire pressure now?

was 33, now that it warmed up, 35.

 

[EagleChief]

I have nitro in my 2015, green caps, cool front came though, still was like 2-3 psi in each tire change Weird.

Same here. My tires dropped to 32-34 psi with Nitrogen. Never had a problem last winter with them. I had to add some air to them, back to 40-42 psi.

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[Smokey613]

My wife's 2014 Laramie CC door placard shows 39 PSI and the dash readout shows they should be at 39 PSI. Still running factory wheels and tires.