What is the Current Tire Size For Sport Trax Dico H78-15 Tires

Question

Question:

I have an ez load boat trailer with Sport Trax Dico ST H78-15ST tires. What size is equivelent to these as a replacement? What do you recommend? Thank you for your help.

asked by: Jonathan W

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Expert Reply:

The current tire size equivalent to your H78-15 trailer tires is ST225/75-15. This tire size will fit on 15 inch wheels that are 6, 6-1/2, or 7 inches wide and they come in three load ranged. Load range C has a weight capacity of 2,150 lbs at 50 psi, load range D is 2,540 lbs at 65 psi, and load range E is 2,961 lbs at 90 psi.

Choosing the correct tire for your EZ Load boat trailer will depend on the weight capacity of the axle. You should choose 2 tires that equal or exceed the weight capacity of the axle. We have 4 tires in this tire size and I have attached a link to them for you to check out. If you would like to send me the weight capacity of your trailer or axle, I would be happy to recommend the correct tire for you.

expert reply by: John H

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Answer 1

The Taskmaster ST205/75R15 Radial Trailer Tire #TTWTRTM2057515C would work well for you. It is the same size as your f78-15st and is a radial. A radial tire flexes more than a bias tire, giving it better ground contact, traction, stability, and tread…

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Answer 2

Radial tires are superior to bias ply tires for highway use so I would go with the #AM32156 that you referenced. Radial tires flex more, which provides better ground contact, traction, stability, and tread wear. A radial tire will normally run cooler…

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Answer 3

We have a galvanized trailer wheel that has a 205/75-14 tire mounted on it with a 5 on 4-1/2 inch bolt pattern. For that I would recommend the part #AM32156. This tire has a high speed rating at 81 mph as opposed to most which are only for 65 mph.

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Answer 4

Typically with a 3500-lbs axle you'll just need to make sure that your wheels and tires are rated for that capacity, so you'd need wheels and tires that are at least 1750-lbs per tire. Something like the #AM32156 is a 14" wheel that is…

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Answer 5

I can certainly help you out with that. If you just need replacement ST205/75D14 tires for your utility trailer then I recommend the Loadstar ST205/75D14 Bias Trailer Tire - Load Range C #AM1ST86. These are rated at 1,760 lbs each, translating to…

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Answer 6

The speed rating for trailer tire #AM3S560, is 65 miles per hour. You would not want to go over 65 miles per hour because that will generate more heat. Heat is the number one enemy of tires, especially trailer tires. This is because trailer tires are…

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Answer 7

If you were to go from the Loadstar ST205/75D14 Bias Trailer Tire - Load Range C item #AM1ST86 to a Provider ST215/75R14 Radial Trailer Tire - Load Range D item #TTWTRTM2157514D you would gain both capacity and speed. It will be just slightly wider…

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Answer 8

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 9

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 10

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 11

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 12

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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