What is the rating of ST175 80D13?
This tire is a 175/80-13 rated for 1,360 pounds at 50 psi and it has an M speed rating which is 81 miles per hour. Special Trailer (ST) Tire Speed Ratings Unless assigned a specific Speed Rating, industry standards dictate tires with the ST designation are speed rated to 65 mph (104 km/h) under normal inflation and load conditions.ST tires have reinforced, thicker sidewalls that control trailer sway and withstand the vertical load of towing. LT tires, by comparison, have more flexible sidewalls meant for ride comfort, not stability.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.
What does ST175 80R13 mean?
Tires beginning with a ST (for example ST175/80R13) indicate a Special Trailer tire and should only be used on car, boat or utility trailers. LOAD INDEX AND SPEED RATING. Example: P225/60/R16 94V. The load index and speed rating, or service description, are the numbers that follow the tire size. ST stands for “special trailer tire. P or LT stands for “passenger” or “light truck” tire. Because of an ST tire’s heavier design, it is designated to carry more load than a P or LT tire. Tread patterns between the two are also specific to their applications. STs have an equal volume of air space.Special trailer tires (STs) are highly recommended by experts as their composition is built to support fifth wheel trailers and travel trailers. ST radial tires offer an even longer lifespan with some reportedly reaching up to 40,000 miles before needing replacement.
What is the difference between ST175 80R13 and ST185 80R13?
In terms of size they are very close to one another; the ST175/80R13 size measures 24. ST185/80D13 size measures 24. Both tire sizes fit on the same wheel sizes, 13-inchers that are 4-1/2, 5 or 5-1/2-inches wide. The D in 75D15 stands for diagonal or bias ply, indicating that the tire’s internal fabric layers are diagonally arranged, while the R in 75R15 stands for radial, meaning that the tire’s internal fabric layers are arranged radially from the center.The D means that you have a tire with a diagonal ply construction. R is a better tire construction, because it means radial. The 13 is the important number because that is the diameter in inches of your wheel. The number of lugs does not matter.The D on trailer tires refers to the tire’s load range or its ability to carry a specified amount of load at a certain pressure. The letter D indicates a load range of 8-ply, meaning it has the strength of an 8-ply tire but isn’t necessarily constructed from 8 physical plies of material.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 does ST185 80R13 mean?
The GlobalTrax ST185/80R13 Load Range D Radial Trailer Tire is a quality tire designed for use on on a variety of trailer types. With a Load Range D rating, this tire can handle loads up to 1,710 lbs. This 13 trailer tire features an ST radial construction for superior longevity and durability. Load range C and D on trailer tires refer to the tire’s load-carrying capacity and inflation limits. Load range C can carry a maximum load of 1,820-2,270 lbs at 50-60 psi, while load range D can carry a maximum load of 2,540-3,000 lbs at 65-80 psi.Answer. Load range C and D on trailer tires refer to the tire’s load-carrying capacity and inflation limits. Load range C can carry a maximum load of 1,820-2,270 lbs at 50-60 psi, while load range D can carry a maximum load of 2,540-3,000 lbs at 65-80 psi.Utility Trailers: Generally, utility trailers should be inflated to a PSI between 50 to 60, depending on the load they are carrying. This range helps ensure stability and allows for optimal handling, especially when transporting heavy equipment.