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Monday, May 29, 2017

Is your TPMS warning psi set correctly?

Originally Posted by Dan O. View Post
"The 'Safety Steer' is definitely a good bit of insurance. I also run the tire monitor system on all six MH tires and the four race trailer tires. I run 110 pounds in the coach tires and did pick up a nail in a steer tire one day. At 80 pounds the tire alarm went off (handling felt the same) and I saw 40 degrees more temperature in the low tire. Point is, some other warning signs are sometimes there before you experience an actual blowout."

I suggest you change the warning psi level. Many TPMS come with a single warning after a loss of 20% from the cold inflation. We all know that when running, tire inflation can increase 10 to 20 % from the CIP (cold inflation pressure). I would suggest that if your CIP is 110 then the warning should be no lower than 100.

Some TPMS provide early warning and alert when the hot pressure has dropped faster than normal so you can gain seconds to minutes advance warning if the TPMS provides "rapid air loss" warning or some other warning based on the hot pressure.

For example
Based on weight my small Class-C needs at least 65 to support the measured load. I use 75 as my CIP and my warning level is 65. My normal hot pressure is 80 to 85. If I pick up a nail I would get a warning if a tire looses more than 3 psi in a couple minutes so I might get a warning at 77 to 82 psi, which is well above the minimum needed by the tires for the actual load.

If a tire loses 20% of the air needed to carry the load it is officially "flat" for warranty purposes so there is a potential that the driving as Dan did with the tire down at 88 was damaging the tire structure which could shorten its life by months or years.

According to the U.S. Tire & Rim Association the warning signal from your TPMS should go off if inflation ever drops to below the level needed to support the actual load on any tire.



  1. Roger,

    I use the TireTraker, and it has a 25% OVER-pressure alert function. Therefore, if I were to set the alarm at 75 and CIP to 85 (for example), I'd get an alert at 94 -- which is easily hit after warming up.

    So I need to set my alert to my CIP when using this particular product. I can't speak to any other TPMS systems in this regard.

    Fortunately, 15% down is my first pressure-loss alert, which gets my attention at 73psi, well in advance of the "danger zone".

  2. I have my Tireminders set high because I get high pressure warnings when they warm up on the road. I figure it really isn't as much about the pressure setting as it is about the change in pressure.

  3. Ideally I would set my Low pressure warning at the air pressure needed to support the measured load on the tire. CIP at that pressure +10%
    High pressure warning at CIP +25% which should be high enough. Remember it is the low pressure that can kill tires.


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