Comparing 175/80-13 And 185/80-13 Tires

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Question:

175 80r13D vs 185 80r13D trailer tires I would like to know if the tire size difference will affect tracking straight, more bounce or less bounce on the trailer? Will the height and the width difference made for better tracking or less? If running at less than weight capacity for example a lighter load should I run the tire pressure lower?I forgot to ask which one is likely to have less wobble at higher speeds. I am assuming it is the 175/80R13D. Due to the tire is not as tall. Do these tires have a speed rating, as they are not car tires but trailer tires. Some states have speed limits that are 80 miles an hour and some have speed limits of 55. Whoud a D load have less wobble and then a C load tire?

asked by: Jamie

0

Expert Reply:

The size difference between the Kenda Karrier ST175/80R13 Radial Trailer Tire - Load Range D # AM10210 and a 185-80R13 tire is the diameter and the width. We don't have any radials in that size, so I'll compare to the similar Kenda Loadstar ST185/80D13 Bias Trailer Tire - Load Range D # AM1ST79. The 175/80-13 tires have a diameter of 24.1 inches and a width of 7 inches compared to the slightly larger 185/80-13 tires that have a diameter of 24.4 inches and a width of 7.2 inches.

The speed rating is based on the specific tire, not the size. The larger # AM1ST79 is rated M for 81 mph. The # AM10210 was recently adjusted to meet the 81 mph speed rating. In this case a bias tire is rated for higher speed but even with the Load Range D being the same category, the bias tire has a load capacity of 1,710 lbs at 65 psi compared to the radial at 1,610 lbs at 65 psi. You won't have tire wobble based on load capacity most of the time, but rather based on speed capacity and weather conditions. Bounce would be affected by load capacity as loaded a highter capacity tire may have better traction when loaded, but unloaded could have more bounce.

For your specific size of tire, I recommend the # AM10210 radial tire of the same size or the slightly smaller size of 175/80-13. I know it isn't the comparison you asked for with two radial tires, because I don't have the one size to judge from but in most cases the radial tire will win out because it can disperse weight better so it has less heat at highway speeds.

You should always run your tires at max psi weather loaded or unloaded for safety. Less tire pressure will cause a safety issue by reducing traction and increasing possiblity of blow out.

expert reply by: Jason S

0

Answer 1

In height or total diameter, a 185/80-13 and 175/80-13 like part #AM1ST77 only differ by about 5/8 of an inch. The 185 would have a diameter of 24.65 inches while the 175 would have a diameter of 24.02 inches. The section width, or thickness of the…

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Answer 2

Karrier and Loadstar are two different brand names used by Kenda. There's no difference in quality or function between the two brand names. For a ST175/80-13 Radial trailer tire in load range D, I'd recommend part #AM10210 if you're…

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Answer 3

I have the perfect tire for your trailer. For a ST185/80R13 trailer tire with speed rating of 70+ mph, I recommend the Loadstar ST185/80D13 Bias Trailer Tire - Load Range D part #AM1ST79. The Loadstar is a bias ply tire with a load range up to 1,520…

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Answer 4

The Karrier ST205/75R14 Radial Trailer Tire #AM10235 would be an excellent radial tire for your camper. We also have the Loadstar ST205/75D14 Bias Trailer Tire #AM1ST86 which, like your original tires, is a diagonal bias tire. The bias ply tire has a…

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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

You can use 7-way trailer wiring with the module part #PP20-702 to provide power to the third brake light of your camper shell/cap. Basically the stop/turn circuits of the trailer wiring need to run to the yellow wires of this module and then the…

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Answer 7

In the galvanizing process, depending on how the manufacturer dries the wheels some of it can pool on one side due to the dipping processed used. That is an issue you are going to run into with many wheel manufacturers. It is an ongoing issue. What I…

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Answer 8

Yes, you can replace your load range C tires with load range D tires without issue. It will only become any issue when you go down load ranges, not up. The tires will have the same overall diameter as long as they are the same size regardless of…

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Answer 9

Some boaters actually swear by closed lug nuts as in general water is kept away from more of the wheel stud. With either setup though you still risk having problems that might cause a lug to break but I wouldn't necessarily blame your issue on…

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Answer 10

The metric equivalent size for an A78x13ST original trailer tire is the ST175/80-13 size you referenced. Changing to a higher Load Range tire will not really affect your ride quality very much. But what this will do is help to prevent excess heat in…

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Answer 11

We offer both of the trailer tire sizes you mentioned, ST175/80R13 and ST185/80D13. In terms of size they are very close to one another; the ST175/80R13 size measures 24.1-inches in diameter and 6.9-inches wide while the ST185/80D13 size measures…

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Answer 12

Trailer tires in sizes 175/80-13 and 185/80-13 will fit the exact same wheel sizes. You can have the 175 mounted on the wheel and use it as a spare but you would not want to run different sizes for long. I have included a link to some trailer tire…

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Comparing 175/80-13 And 185/80-13 Tires

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