Replacement Size 205/75-15 Trailer Tires

Question

Question:

I have an 18 foot pipe trailer that hauls dirt, cars and a John Deere Tractor. The 2 year old tires did not wear well at all. The tires on the trailer are ST205/75D15. I had expected more than 2 years of service. Any recommendations?

asked by: Robert C

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Expert Reply:

The most common reason trailer tires fail or don't last is from under inflation. Trailer tires should always be inflated to their maximum psi when the tires are cold. This is because trailer tires are constructed with a thicker sidewall than passenger vehicle tires to handle the increased vertical load. If the tires are under inflated the thicker sidewall will generate even more heat.

Other factors that can cause a tire to wear is exceeding the tire's speed limit rating or overloading them by carrying too much weight on your trailer. Tires are rated for speed and load capacity and going too fast or heavy will put added strain on the tires.

The damage to a tire is mainly caused because one of the above situations causes them to get too hot. Your current tires are bias tires which generally run hotter than radial tires. So you may want to replace them with radials. A radial tire will also flex more so it has better ground contact and traction which will improve the tread wear.

For a radial tire, size 205/75-15 I suggest the Westlake # LHWL300. These have a load range D with a maximum rating of 2,150 pounds when fully inflated to 65 psi. The maximum speed rating is 75 mph. They also come with a 5 year warranty.

expert reply by: Charles S

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Answer 1

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 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

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 4

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 5

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 6

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 7

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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Answer 8

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 9

The wheels for your ST215/75R14 sized tire on your 2022 Coleman Lantern 17B are 14" X 5-1/2" wheels with a 5 on 4-1/2 bolt pattern. The Karrier ST215/75R14 Radial Trailer Tire with 14" Galvanized Wheel - 5 on 4-1/2 - Load Range C, part…

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