What Are The Alpha-Numerical Codes On ST Tires?

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Question:

I have a 1968 vintage Frolic trailer with wood paneling inside. The tires are ST225/75R15. Following this description is the following: LRE 10PR 117/112L. Does this mean I am to put 117 pounds of air pressure in the tire? This seems high.

asked by: Steve

1

Helpful Expert Reply:

No. The 117/112 is not the psi. It is the load index. The L is the speed rating of 75 mph. The load index is the rated load capacity for single and then dual tires on each side of the axle. 117=2833 lbs. The maximum psi should be listed on the tire sidewall and is also the recommended psi for the tires to operate.

For instance the Loadstar ST225/75D15 Bias Trailer Tire - Load Range D # AM1ST96 is similiar and rated for 65 psi max.

expert reply by: Jason S

1

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Answer 1

The 117/112L that you are seeing on your tire is in reference to the load range and speed rating. There is tire load index chart for light truck (LT) tires and the 117 corresponds to 2,833 lbs for single tires and the 112 corresponds to 2,469 lbs…

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Answer 2

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 3

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13…

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Answer 4

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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Answer 5

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6-1/2 inch whereas the 225/75-15 fits widths that are 5 inch to 6 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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Answer 6

The three most common lug stud sizes for a trailer are 1/2"-20, 9/16"-18, and 5/8"-18. In order to make sure you get the correct lug nuts you need to measure the lug studs on the trailer now as we have no way to look this up for…

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Answer 7

Your math is correct in your trailer weight load example. If a fully-loaded tandem axle trailer weighs 4000-lbs then each of the 4 tires will bear 1/4th of that load, or 1000-lbs. In this case a tire rated for 1300-lbs would provide a good safety…

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Answer 8

You can add larger wheels and tires to a trailer as long as you have enough room for the larger size. The main clearance issues we find when putting larger tires and wheels on a trailer is from the top of the tire to the fender and from the inside…

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Answer 9

Good morning, Cliff. As of today (3/27/24) we are expecting the #KE33JR tire/wheel combo to be in stock in about 2 weeks. Hopefully this means we can take our own pictures and put them on the site within maybe about 3-4 weeks from now. What I can…

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Answer 10

The 12 inch tires that we carry are rated for 65 miles per hour. Any faster than that for extended periods and the excessive heat build up will cause tire failure. To get a tire with a higher speed rating you would have to go up in size. That also…

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Answer 11

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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Answer 12

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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What Are The Alpha-Numerical Codes On ST Tires?

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