What does the D mean on a ST175 80D13?

The difference between the letter D in your ST175/80D13 and the R in the tire size of the Wheel and Tire ST175/80R13 part # AM31985 that you referenced is the tire construction. D stands for bias-ply which is a less preferred tire construction, whereas R stands for radial.

What’s the difference between 175 80R13 and 175 80D13?

The D in 175/80D-13 indicates that it is a bias ply tire where as the R in 175/80r-13 indicates that it is a radial tire. The difference is how the steel belts inside are oriented. Bias ply tires are generally better in off road types of situations. Radial tires track better and run cooler.

What is the difference between ST175 and st185?

The biggest difference is capacity. The smaller 175 that you referenced has a capacity of 1,360 pounds at 50 psi. The larger tire that I recommend as a replacement to the existing 185 tires you have has a capacity of 1,710 pounds at 65 psi.

How much air is in a ST175 80D13?

On a ST175/80-13 tire that has a load range of C, like the Kenda Tire and Wheel, part # AM3S160, you will want to run the maximum of 50 lbs of air pressure. That will give you a total weight capacity of 1,360 lbs per tire or 2,720 lbs for 2 tires on your camper.

What size is st175 80d13?

175/80R13 tires have a diameter of 24.0″, a section width of 6.9″, and a wheel diameter of 13″. The circumference is 75.4″ and they have 840 revolutions per mile.

What do the numbers and letters mean on a trailer tire?

The first number, 205, refers to the width of the tire in millimeters. The second number, 75, refers to the tire’s sidewall aspect ratio (also called section height) and means in your case that the aspect ratio of your tire is 75% of the tire’s width. The R letter indicates the tire has radial construction.

What size is ST175 80D13?

What does ST185 80R13 mean?

Loadstar ST185/80D13 Bias Trailer Tire # AM3S331 is a bias ply construction whereas the 185/80R13 you have is a radial tire construction. The difference is how the plies run inside the tire. You would want to keep the construction type the same on the trailer for best performance and even tire wear.

What is the difference between 185 80R13 and 175 80R13?

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.

What PSI should my boat trailer tires be?

between 50 and 65 psi
Boat-trailer tires require a lot of air pressure — in most cases, between 50 and 65 psi. In fact, the correct tire pressure for your boat trailer is almost always the maximum-rated pressure for that tire, which is molded right on the sidewall. Maintaining that trailer tire PSI is critically important to towing safety.

Should trailer tires be filled to max PSI?

When it comes to trailer tires you always want to have them inflated to their max psi when cold. Not only do you get the full capacity at the max psi, you also will generate less heat in the tire since there won’t be as much flex in the sidewall, you’ll get better wear and better fuel mileage.

What is the difference between 4.80 and 5.30 tire?

A 4.80-12 tire will be 20.5 inches in diameter whereas a 5.30-12 tire will be 21.9 inches. You would need to make sure that the is more than 3/4 of an inch above the 4.80-12 tire to be able to use a 5.30-12. The smaller 4.80-12 is 4.9 inches wide. The 5.30-12 is 5.6 inches wide.

Can I use 175 tires instead of 185 on trailer?

Expert Reply: 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.

How tall is a 185 80R13 tire?

Tire Size Calculator – Tire & Wheel Plus Sizing BETA

Should trailer tires be run at max psi?

Is 65 psi too much for trailer tires?

Yes. I keep mine at 65 PSI. It’s most important if you are close to the rated limit on the tires. If the loaded trailer weight is significantly lower, then going a bit lower is OK.