Capacity and PSI Rating for 4.80-12 Load Range C Trailer Tire

Question:

The 4.80-12 tire has a c rating and states u should have 90 psi in the tires. Is this correct, am I reading this wrong?

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Expert Reply:

You are correct. That is a load range C tire rated for 990 pounds at 90 psi. Trailer tires should always be inflated to the maximum psi indicated on the tire. This is because trailer tires are built with a thicker sidewall than passenger vehicle tires.

If under inflated the thicker sidewall will generate excessive heat causing the tire to fail. I have included a link to our help article on trailer tires for you. I have also linked the 4.80-12 tires we carry. Tire # AM10062, which is the same size and load range as the tire you have, has the same 990 pound and 90 psi rating.

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Michael H

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