What is the Meaning of the Letter in the Trailer Tire Size

Question:

I wanted to know what the letters after the size 15?, because they're either "C"," D",etc;;. Need a very thick durable trailer tire.

asked by: David

Expert Reply:

The letter in the tire size refers to the load rating of the tire. For the tire you referenced, the Loadstar ST185/80D13 Bias Trailer Tire, the tire is a Load Range D tire. This means that the maximum load of the tire is 1,725 pounds at 65 psi.

A Load Range C tire will have a lower capacity than a Load Range D tire.

All of the tires we offer for 185/80-13 size tires have a Load Range D rating.

I have attached some help articles on trailer tires for you.

If you can confirm your tire size and weight of your trailer, I will be happy to recommend a tire for you.

expert reply by: Victoria B