Cold tire pressure

[Lisa & Bob]

I have used a Jayco FlowPro Digital Tire Inflator to have 50psi in our R1S 20” AT tires when cold. Currently 50 at 6000’. When I begin driving (after reset) the vehicle is reporting 47psi.

Any others having this discrepancy?

What should the vehicle be reporting after operating when the tires are “warm”?

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[RoadRunner]

my TPMS read lower than my tire guage also. Approx 3-4 PSI lower but each one is a bit different.

 

[jfoonly]

Yes, my G1 R1S reports -2 to 3 psi for both TPMS and the rear compressor/inflator vs quality handheld gauge. I see only 1-5 psi higher from tpms while driving, but it could be 1psi per 10F tire temp.

 

[Mathme]

Tire pressures will vary based on the device measuring them, ambient temp, is the tire in the sun or shade, and elevation as all can affect readings. I tend to set my tire pressure with a gauge, then note whatever TMPS says and use that as a rough gauge to tire pressure. Even with TPMS, it's still good practice to check your tires monthly.

 

[iansriv]

The recommended psi is 48 on AT 20s. I like to live life dangerously. Sometimes I will overinflated to 50 and sometimes I will let it get as low as 46.

 

[Greg Chick]

I too see varying pressures, even if all the same at one point, as much as 3 psi difference between some tires. I seek to keep them over 47 psi and under 54 psi. I live at 5,000 ft. elevation, and drive as low as 200 ft. elevation in a couple hours time. As well, the temps can vairy 40 degrees. I have decided to not over react.

 

[SwampNut]

Compressors get very hot and I've seen the pressure drop as the air cools.

 

[dleepnw]

my cold PSI is typically spot on or +/- by 0.5 PSI. something seems off about yours. once warm it's anywhere from 3-5 PSI higher depending on outside temps and length of drive.

 

[ltphoto]

Same with mine. TPMS seems very accurate compared to gage I use. Highest I've ever seen during a long drive is +4.

 

[Oldsmobile_Mike]

With moderate air temps and vehicle parked inside a garage, my gauge reads 48. TPS Reads 48. compressor on the truck reads about 46. Once the vehicle has been driven for a while they warm up to about 50-51. No issues with any of this, just what I'm seeing on mine.

 

[sfvR1S]

I don't think 1 psi is going to make your truck explode

 

[Jumpjack]

I'm seeing TPMS readings approx. 3psi less than my gauge and not evenly meaning I see individual tire pressures as much as 2psi different on the TPMS when I'm pretty sure I was within 1psi difference when inflating.
I was doubting my (pretty cheap) gauge but reading through this thread I'm now inclined to believe the gauge over the TPMS.

 

[PunkRockDoc]

I inflated my tires with the on board compressor to 48 psi. The TPMS read them as 50 psi. Not sure which to trust.

 

[John G.]

I inflated my tires with the on board compressor to 48 psi. The TPMS read them as 50 psi. Not sure which to trust.

Tire pressure gauges are a lot like clocks. If you have more than one clock...you really never know what time it is?

 

[Frisbee]

I have three different manual tire pressure gauges. They all read very close to each other. The TPS readings on my present R1T (21” tires) consistently run 3 pounds less than the manual gauges. My prior R1T had 20” AT tires and the readings were similar. I live at 7,000 feet and garage the vehicle. I run 50 pounds measured with the manual gauge after the vehicle has set overnight. Tires seem to be wearing evenly.

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