Tire Pressures

[ManyCamaroz]

I was just wondering what pressures you all are running in your rear tires when not loaded. I was considering backing the rear down to 65 psig for a softer ride instead of the recommended 70 psig when not loaded.

[Flatus]

I run 65 in the rears. I believe some run even lower than that.

[Another JR]

I have a 2021 3500 cclb srw gas with 18” wheels and original stock Michelin tires, so the recommended rear tire pressure at full load is 80 psi. The rear TPMS alarm is at 62 psi. I run at 63 psi in the rears even when I have my light pop up truck camper installed (1800 lbs wet and loaded, 1700 of which is on the rear axle). I run 57 cold in the front. With the camper installed my front and rear axle weights are about equal.  My payload rating is 4054 lbs, so with the camper I’m at about 50% of payload. I’d run the rear at 55-57 unloaded if the TPMS warning didn’t go off.  My tire wear seems pretty even so far at 11,000 miles. 

[UWSkier]

I tried running mine down around 50 in the rear and even with that, my tire shoulders are barely touching the ground if I do the chalk test.  And the TPMS whined.  You can apparently have the threshold of warning set lower.  I might do that.

[Another JR]

41 minutes ago, UWSkier said:

I tried running mine down around 50 in the rear and even with that, my tire shoulders are barely touching the ground if I do the chalk test.  And the TPMS whined.  You can apparently have the threshold of warning set lower.  I might do that.

Please post if you find out how to get that done. It was previously discussed as a possibility but nobody posted a way to actually do it. Thanks.   
 

The one concern I can see about resetting the alarm point lower is that the alarm point is too low if you actually are fully loaded and therefore need to run at the max pressure.  If I was carrying 4000 lbs in the bed at highway speeds for a long run I’d want the alarm point where it is. 

[MaverickZ71]

11 minutes ago, Another JR said:

Please post if you find out how to get that done. It was previously discussed as a possibility but nobody posted a way to actually do it. Thanks.   
 

The one concern I can see about resetting the alarm point lower is that the alarm point is too low if you actually are fully loaded and therefore need to run at the max pressure.  If I was carrying 4000 lbs in the bed at highway speeds for a long run I’d want the alarm point where it is. 

 

You can pay a GM dealer to do that for you, but some dealers refuse to do so because of potential safety liability issues. Or you can buy a pricey GM scanner/programmer that will allow you to change the TPS alarm thresholds as needed, amongst other things.  

Edited December 1, 2023 by MaverickZ71

[Another JR]

3 minutes ago, MaverickZ71 said:

 

You can pay a GM dealer to do that for you, but some dealers refuse to do so because of potential safety liability issues. Or you can buy a pricey GM scanner/programmer that will allow you to change the TPS alarm thresholds as needed, amongst other things.  

Thanks

[rjgvt]

I have an Autel TS508 that I use to relearn the TPMS sensors when I swap wheels/tires between summer and winter. The manual states that the tire pressures on the placard can be changed but I have not used that feature yet. When I get my AT4 HD, I’ll probably try that feature once I figure out what tire pressures give the smoothest ride with a cap on and all of crap I carry around in the truck and bed. 

[reb0957]

Running tires at the recommended pressures when not loaded just prematurely wears the tires. Usually, just the center. The only time I need max pressure is when pulling my tractor. Since I don't do that often, I don't care. The 1st thing I do when grabbing the tractor is checking all 8 tires truck/trailer. If you are worried about the tires going down with a load, turn on the tire screen. You can see my new settings on the pic. They crossed the front and rear numbers.

[Epsilon Plus]

One of the reasons I'll be buying the Pulsar LT when I change sizes is it's reported ability to change the alarm point. I'm currently getting texts, emails, and truck yelling at me about one of them at 64. I would probably run about 50-55 on the Nittos when I get them. I haul mostly sail boat fuel and don't need to be aired up so ridiculously all the time.

[Wxman]

As to OPs original question.  I have been running 58 ft / 55 rr in my 2500 for 25000 miles.  Air them up to 60 and 70 when towing the RV.  No unusual wear.  Do get the occasional TPMS warning on the rear on cold mornings etc.

I have the 20 wheels and the OEM Goodyear Trailrunners.

 

Happy trucking!