Tire pressure question

[Choatecav]

Love my 2021 Mojave but honestly, this is my first Jeep and first vehicle with large tires.
Here in TN we hit -5 degrees Friday and not much better since. My tire pressure alert has gone off saying I need to increase pressure to 37 psi and are down near 30.
While I know the cold weather lowers the pressure a bit, but is this magnified by having larger, fatter tires?? During normal weather it is not a problem but cold really plays havoc with this.
thanks,

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[ShadowsPapa]

Tire companies and tire sellers are now saying to air them up in cold weather - like in Iowa winter, I go air my tires up to a bit below where I might run them in summer - 34-35 for example.
More air, more "air shrinkage" in winter.
Mine would normally be at 28-29 if I didn't air them up in the winter. Today they were about 34 average, just below normal summer pressure.
In the spring I'll drop them as needed.

 

[Hootbro]

Just part of experience of owning it that usually you will have add air for winter and possibly deflate air when it warms up.

 

[Lunentucker]

Love my 2021 Mojave but honestly, this is my first Jeep and first vehicle with large tires.
Here in TN we hit -5 degrees Friday and not much better since. My tire pressure alert has gone off saying I need to increase pressure to 37 psi and are down near 30.
While I know the cold weather lowers the pressure a bit, but is this magnified by having larger, fatter tires?? During normal weather it is not a problem but cold really plays havoc with this.
thanks,

'21 Mojave here as well.

1. 37 on the stock Falkens is stupid. Not you stupid. Jeep stupid. Try 33-35

2. On the gen 2 TPMS, which you likely have, you will need to EXCEED the placard inflation number by 4 PSI or more to clear the warning light.

3. You can adjust the warning PSI to whatever you want it to be using any one of a number ODB tools.
I used ECRI, which doesn't do as many things as the Tazer, but it also only costs about $100.
https://ecri.app/products/ecri-wireless-vehicle-calibration-device?variant=31532634832951

 

[onewhippedpuppy]

The TPMS on my JT is easily the most picky of any vehicle I’ve owned. Just a few psi is all that’s required for it to start nagging, and nagging, and nagging. This is made even worse by the fact that I liked my stock Mojave tires best at 34 psi, so any drop in temperature triggered the warning. Now I have a Taser, much better!

 

[ShadowsPapa]

1. 37 on the stock Falkens is stupid. Not you stupid. Jeep stupid. Try 33-35

As I recall, even the stock Rubicon with stock Falkens says 36 on the door.
I had good luck with 35-36 when I had them on my Overland - even did the chalk test thing and it was determined to be correct.

And if you think about it, if the correct pressure for my Generals - according to their consumer support engineer (he was a real engineer, BTW) was 35, why would a taller and wider tire use MORE pressure?
I upped my winter pressure the other day - running 35 in front at 10 degrees.

LOL - Jeep stupid. Good one.

 

[Choatecav]

Thanks fellas, for your time and advice.

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