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How to Set Tire Pressure Monitoring System for 4.80x12 Trailer Tires with Maximum of 100 PSI

Question:

Last year I purchased 2 480x12 LR ā€œDā€ tires. The rated cold press is 100 psi. I am running them at 100 psi. I am also using a TPMS on them. Can you tell me what the high pressure limit that I should set the TPMS at? Thanx

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Expert Reply:

Trailer tires should always be inflated to the maximum psi as listed on the tire's sidewall. This means for your 4.80-12 size tires with a Load Range D, they should always be inflated to the 100 psi mentioned in your question. When setting up your TPMS, this is the baseline pressure you will want set for the tires on your trailer. The high pressure limit/alert on the system will then be activated if there is a pressure increase of 20% or more from this baseline number.

I have attached a couple articles on trailer tires that you might also find helpful.

expert reply by:
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Chris R

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