Possible Replacements for 5.75 x 15 and 8.75 x 16 Trailer Tires for Boat Trailer

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Question:

Hi Kyle,Im writing you to tell you that I was mistaken over the trailer tire size,its 8.75x16 Lt,bias ply.paylode E, 6 bolt galvanized rim. Im sure this changes the equation.Any thoughts? Thanks

asked by: Paul

1

Helpful Expert Reply:

The LT on your tires stands for "Light Truck" and while there aren't any specific replacements for 5.75 x 15 tires, what that size means is you have 15 inch diameter wheels and tires that are 5.75 inches wide. The closest we offer to that size is a 205/75-15, which is for 15 inch diameter wheels and are 8 inches wide. You may need new wheels as well because these tires are designed to fit 15" x 5", 15" x 5-1/2", 15" x 6", and 15" x 6-1/2" wheels.

The option we have with the highest load range is the Karrier ST205/75R15 Radial Trailer Tire - Load Range D # AM10245 which are 8" wide and 27.3" total in diameter, and fit one of the aforementioned wheel sizes. Keep in mind with trailer tires, the general rule of thumb is you want at least 3" of clearance from the top of the tire to your fender and at least 1" of clearance between the inside of the tire and your trailer's frame rail.

I have added links to a number of help articles on trailer tires which I recommend checking out.

expert reply by: Kyle S

1

Paul

3/25/2020

Thanks Kyle,do you have galvanized wheels in those sizes?

Reply

Kyle S.

3/25/2020

We do have 15 inch galvanized wheels: - Steel Spoke Trailer Wheel - 15" x 6" Rim - 5 on 4-1/2" - Galvanized Finish # AM20524 - Steel Spoke Trailer Wheel - 15" x 6" Rim - 6 on 5-1/2" - Galvanized Finish # AM20534 The 5 on 4-1/2" and 6 on 5-1/2" refers to your bolt pattern, which you need to know in order to get the right wheel. If you aren't sure of what your bolt pattern is I've added a link to a help article on how to measure bolt pattern as well as a handy template for bolt patterns.

Reply

Paul B.

4/6/2020

Hi Kyle,Im writing you to tell you that I was mistaken over the trailer tire size,its 8.75x16 Lt,bias ply.paylode E, 6 bolt galvanized rim. Im sure this changes the equation.Any thoughts? Thanks

Reply

Kyle S.

4/6/2020

The closest thing we have to an 8.75 x 16 tire is a ST235/80R16 trailer tire, which is 9.3 inches wide compared to the 8.75 inch tires you have now. For this size tire I recommend the Westlake ST235/80R16 Radial Trailer Tire - Load Range E # LHWL401. I really like the Westlake tire because of its deep 10/32" tread depth and the fact that it has a 5-year warranty, which is quite a bit longer than most. These tires also have free roadside assistance for two years just in case you should ever get a flat, which is a huge benefit for travelers. These will fit 16 inch wheels with a 6 bolt pattern such as the Steel Spoke Trailer Wheel - 16" x 6" Rim - 6 on 5-1/2 - Galvanized Finish # AM20747. I have added links to video reviews for you to check out as wel.

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Answer 1

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 2

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 3

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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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

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 6

Since both a ST145/R12 size tire, like the Kenda Karrier S-Trail #AM10130, and a 5.30-12 size tire, like the Kenda K353 #AM10068, fit a 12 inch wheel, a ST145/R12 size tire can replace a 5.30-12 size tire. Keep in mind that these tires do have…

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Answer 7

The difference between the two trailer tire sizes is that the letter D in the first size you listed ST205/75D15 stands for bias ply and the letter R in the tire size that they put on your vehicle stands for radial. Radial tires are preferred over…

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Answer 8

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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Answer 9

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 10

I have attached a chart you can check out that describes the torque needed per wheel size, wheel stud size and material. For an 8-inch wheel with a 1/2-inch wheel stud the torque is 75 to 86 ft-lbs. For a 15 inch steel wheel with 1/2 inch wheel studs…

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Answer 11

A BT8 spindle would have a diameter of .99 of an inch where the bearings would both install and would have a diameter of 1.24 where the great seal would ride. That would require a hub part #AKIHUB-440-2-1K for an idler hub. A BTR spindle would have…

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Answer 12

The difference between a D15 tire and an R15 tire is the construction. The D denotes that it's a bias tire and the R is for a radial tire. Which is best for you depends on the type of terrain you're towing the trailer on because bias tires…

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Possible Replacements for 5.75 x 15 and 8.75 x 16 Trailer Tires for Boat Trailer

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