Can Tire Pressure Be Lowered When Going with a Higher Load Range Trailer Tire

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Question:

My 5th wheel came with d rated 225/75/15 tires. Can I put on e rated tires and just keep the air pressure at 65 pounds.

asked by: MikrTokle

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Expert Reply:

Special trailer tires should be inflated to their maximum air pressure. The value for the maximum air pressure should be listed along with the value for the maximum load on the tire's sidewall. These values will usually designate the maximum load at a maximum psi. For example, if the tire is rated at 1,610 lbs maximum at 65 psi, the tire can carry 1,610 lbs of weight if the air pressure is at the maximum of 65 psi. At the maximum air pressure, the tires will perform and wear best, and get the best gas mileage.

If a trailer tire is inflated to a lower air pressure than the maximum, the amount of weight that the tire can carry will be reduced. If a heavier load is put on the trailer tire than what is recommended for that air pressure, the sidewall of the tire could heat up and cause the tire to fail.

I can only recommend you keep the max pressure of 80 psi in the Karrier ST225/75R15 Radial Trailer Tire # AM10303 at all times.

expert reply by: Jameson C

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Answer 1

Firestone trailer tires but I would also recommend you look at the Karrier #AM10303 which is the ST225/75R15 that you are wanting. This tire has a speed rating at 81 mph. I attached a review video for more info on it as well.

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Answer 2

The Kenda Karrier ST225/75R15 Radial Trailer Tire - Load Range E #AM10303 would work just fine to replace the Westlake ST235/75R15 tires currently on your trailer but will be about 1/2" narrower and shorter. The #AM10303 has a load rating of…

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Answer 3

I was able to find that your 2019 Forest River Cherokee Grey Wolf 27RR comes with 205/75R14 tires load range D on a 14x5.5" wheels and uses a 5 on 4-1/2" lug pattern. If you want to get to a 10-ply rated tire you will need to move to a…

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Answer 4

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 5

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 like…

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Answer 6

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 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

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 9

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 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

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Can Tire Pressure Be Lowered When Going with a Higher Load Range Trailer Tire

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